Compare the alternatives on how they bill you, not on feature checkboxes.
Almost none mention the thing that actually decides your invoice.
You pay it in the month you publish 400 posts, and in the month you publish none.
You buy all three whether or not you use any of them.
The seat minimum, and the price of one extra user. A headline rate with a three-seat minimum is really three times the headline.
So an X-only tool can pass it through: 1 credit to read your own post, 10 to reply to a mention, 15 to publish.
Publishing anything containing a URL costs 200 credits against 15 for a plain post. The link is the expensive object, not the post.
Credits come out when the post actually goes out. A cancelled post is free, which is not true of a seat you already paid for.
Two networks or fewer, and under three people publishing? You are funding seats and connectors you never fill.
The full comparison table, the per-action price list, and the migration order that keeps your queue intact.