Three ways in, three different questions
Hosting comparisons usually treat plans as a single ruler: pricier means stronger. Here there are three entry points and each answers its own question. Minecraft Fácil answers how many people will play. Budget and Performance answer how much work the server does on every tick.
Fácil has four named plans: Party, Plus, SMP and Pro. You pick by the recommended player count and the server comes up, with nobody asking about heap size. Budget and Performance open the decision up: twelve RAM steps, from 4GB to 64GB, plus the processor choice.