Most comparisons lead with language count and price. Both are easy numbers for a listing page, and neither predicts whether translation actually works well for your specific server. Three questions do.
A per-server plan covers every member under one subscription. A per-user plan is billed to each individual who wants the paid tier, typically following them across servers. Per-user pricing can be cheaper if only a handful of members need translation; per-server pricing is the only shape that covers a whole community without asking members to pay individually.
Two bots can both advertise unlimited free translation and mean different things by it. Some meter a monthly allowance of context-aware translation and stop there. Others meter the same allowance but quietly fall back to a weaker engine once it runs out, without saying so plainly. Worth asking directly: does the free tier run the same engine as paid tiers with less volume, or a different, lesser one once volume runs out?
Ask specifically what happens once a server configures more than two or three target languages in the same channel: does every reader see every translation regardless of which language they read, or can delivery be scoped to just the person who needs it? Usually invisible in a two-minute demo, very visible three months in.
Pigona is per-server, runs the same Smart Context Engine on every tier including free, and gives four delivery mechanisms to scope where a translation lands.
From Pigona - the context-aware AI translation bot for Discord.