You can select the chain you want on Gupax now.

There are certain kh/s that serve each pool the best under 10 yeah nano, 10 -100 mini and over 100 main is somewhat the default numbers I've seen around.

Gupax has xmrvsbeast now integrated in which is nice as well.

monerostar

Idk what options gupax offers for which p2pool chain, but if you have less than 10KHS, you would probably be better off on P2Pool Nano. If you have more than that, you'd probably be better off on P2Pool Mini. And if you have a ton of hashrate, then you can use the P2Pool main chain

The difficulty is so high on the main P2 pool chain that using a regular consumer CPU probably won't do much for you. But on something like Mini or Nano, it has a much better shot

monero

How To Mine Monero (XMR) via Gupax

CR1337

Idk what options gupax offers for which p2pool chain, but if you have less than 10KHS, you would probably be better off on P2Pool Nano. If you have more than that, you'd probably be better off on P2Pool Mini. And if you have a ton of hashrate, then you can use the P2Pool main chain

The difficulty is so high on the main P2 pool chain that using a regular consumer CPU probably won't do much for you. But on something like Mini or Nano, it has a much better shot