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Wordpress caching - what have you found most trouble-free?
I provide hosting for 50+ sites. Variety of types. Many are simple "brochure" sites with essentially no user interaction (no forms, e-commerce or other dynamic content) and low traffic, and I have no issues on those related to caching. A chunk of the sites get more traffic, have forms and other interactions. One of my biggest/busiest sites is a WooCommerce site.
For 5+ years I ran WP Rocket on most sites with few issues. I host many sites using RunCloud.io, and sometimes use their caching along with WP Rocket, but typically I haven't bothered. With WP Rocket, I occasionally would need to change the configuration/exclude a page or script, etc. WP Rocket changed their pricing/license model and it no longer felt like a good fit for my situation, so I swapped to FlyingPress about a year ago.
It has been a bit rocky with FlyingPress. I know they are still under active development (including the release of v5 this year, which has been a bit rocky as well). There are some sites that I've continued to run into little issues with, and I feel like it hasn't improved substantially.
My Flyingpress renewal is coming up in a couple of weeks. I'm wondering whether it's still considered the best option for caching WP, or whether I should drop it and look at other options. I don't need the ultimate/perfect caching solution. Just looking at something that will help my heavier sites respond a bit more quickly without too many hassles. I'll give up ultimate speed if it means we don't get unexpected issues cropping up that need to be troubleshot frequently.
What are all you WP folks using? What has been the most trouble-free "recipe" for your caching needs?

Comments
If you’re running Litespeed, then Wordpress Litespeed Cache plugin works well and is free. Layer Cloudflare on top of this and you should be good to go.
Running nginx on all my servers currently. Tested OLS a while back and didn't see much difference, so I just stick with nginx.
If you use a server that is utilising LiteSpeed then look at using the LiteSpeed cache plugin. Couple this with Redis and maybe a CDN and you'll be good.
I like Varnish with lots of exclusions (Cloudpanel’s are good) with a like 30 second cache TTL. Then you don’t need automatic clearing of cache at all really.
Many of our shared hosting customers are extremely happy with Litespeed w/ LSCache
This one and coupled with a custom nginx subdomain for static files as CDN(disallow all except static files with 30m cache) endpoint over CF(for global distribution) with a cache rule, and you get yourself an insanely fast WordPress site. Note: doesn't work with woocommerce as it's boggy and hoggy and caching doesn't work wonders for e-commerce on top of that.
Varnish, Redis and or memcached. Those free solutions boost wp considerably, but requires knowledge.
docket cache is a pain in teh arse. do some of the above also work without litespeed?
Do you have solution for Woo?
And maybe solutions how to speed up Checkout process because you can;t cache checkout ...
Solutions? There are plenty, let me break it down for ya.
Stop using Wooo and migrate to something better, like Shopware or medusajs.
If you really want to stick to Woo, here are more: utilise faster single-core CPUs(the reason you can probably guess, PHP), use Redis for in-memory and literally everything, offload as many things as possible to different endpoints to minimize server load, use element cache if available for Woo, stop using bloated plugins, and only use plugins when strictly necessary. Use Express Checkout and the CF waiting room for heavy sale traffic(if there's any). Use MariaDB 11.4 and fine-tune it as best you can. If you can achieve all that, I believe you should have a fairly fast Woo store, and if you can't, then it's better to pay someone who can do that for you.
Thanks, for great tips.
Will check how this will be going
Shopware or medusajs will leave for someone else either price wise, either SEO have a lot of questions.
Both open sourced under MIT license so if you have a dev team it's fairly easy to work with them, as for SEO it's dead officially and unofficially your best bet with sales digital marketing, i hardly see any store especially new one benefitting with SEO instead they ride the coattails of big influencers or celebrities for exposure, know a couple of brands whose SEO policies are non-existent. Even though some say WordPress is good for SEO or whatnot, but reality is a far-fetched dream. For your questions, you can list them here. I believe some of our members have a better understanding and are willing to smash their keyword buttons for ya.
So far i will stick with SEO method for traffic, yes if you working in company you can build everything on Ads, but for Family business every dollar matters. I'm running small wife's Pottery shop https://www.claypoetry.lt/ and 40-50% of traffic and sales comes from organic source, so not bad at all.
Thanks for your tips, will check Shopware or medusajs for sure.
Checked the store, looks good enough, the optimizations are certainly there, I can feel it when it loads. The next steps you can look into are simple: a different endpoint for statics with better edge caching than the entire website, express checkout, perhaps Stripe, or ideal(not sure) should work.