Not an assistant so much as a way out of the choice. Poe puts the major models behind one interface and one bill, so you can ask the same question of several and keep whichever answer is best, and switch when the leaderboard changes next quarter without changing anything about your setup. For anyone genuinely unsure which alternative to commit to, it is the cheapest way to stop guessing.
Because it is a layer on top, it always lags slightly on the newest features each provider ships in its own app, and heavy use burns the monthly allowance faster than a single subscription would. It suits people who use several models lightly rather than one model constantly.