I use Lincoin pool, fpps, 100k free auto withdrawal threshold, good UI, lots of useful tools and diagnostics. You can get the pool fee waived if you use crypto mine firmware (terrible name) too. I just started using the firmware on an s19 and have been happy with it. I haven't had a good reason to plug in an s9 in a while but I plan on trying the firmware out on it when I do fire it up again.