A single GPU rig or a single Etchash ASIC holds only a tiny fraction of the total Ethereum Classic network hashrate. Without a pool, finding a block would be pure luck and, depending on computing power, could take weeks or months. A mining pool bundles the computing power of many devices, finds blocks regularly as a result, and distributes the block reward proportionally to the hashrate contributed - predictable instead of random. In return, the pool charges a fee, usually in the low single-digit percentage range.
How PPS, PPLNS and FPPS work in general is explained in detail on the mining pools overview page. The same logic applies to Ethereum Classic pools: what matters is always the combination of fee and payout model, never a single value on its own.
Because Etchash is designed to be GPU-heavy, classic GPU rigs still mine in the same Ethereum Classic pools alongside specialised ASICs such as the Antminer E11 series. A pool bundles every hashrate contributed regardless of the hardware behind it and distributes the reward proportionally - so it makes no difference to the pool choice whether you mine with graphics cards or with an ASIC.
Besides fee and payout model, what counts when choosing a pool: how close the stratum server is to your own location, the minimum payout, the transparency of the published statistics, and the operator's reliability and track record. Switching pools is possible at any time and takes only a few minutes: simply replace the stratum address in the miner dashboard. Customers who host Ethereum Classic devices with Cryptohall24 choose their pool freely themselves; our team is happy to help with setup on request.