A single ASIC holds only a tiny fraction of the entire Alephium network hashrate. Without a pool, finding a block would be pure luck. A mining pool bundles the computing power of many devices, finds blocks regularly as a result, and distributes the emission proportionally to the hashrate contributed - predictable instead of random. In return, the pool charges a fee, usually in the low single-digit percentage range.
The common models PPS, PPLNS and FPPS differ in how the risk of individual block finds is distributed between the pool and its participants - a detailed explanation is available on the mining pools overview page. For devices running continuously, the models largely converge over time; what matters is always considering fee and payout model together.
Because Alephium runs on several parallel chain groups via the BlockFlow architecture, an Alephium pool must be able to assign participants' incoming hashrate to the individual chain groups. When choosing a pool, make sure the operator technically supports Alephium's sharding architecture and transparently discloses the distribution across chain groups.
Besides fee and payout model, other factors matter when choosing a pool: the proximity of the stratum server to your own location (shorter latency reduces the number of rejected shares), the minimum payout, the transparency of the published statistics, and the reliability of the operator. Switching pools is possible at any time and takes only a few minutes: simply change the stratum address in the miner dashboard. Anyone hosting their Alephium devices with Cryptohall24 chooses the pool freely; our team is happy to help with setup on request.