Once you get to 2-3 Stars, some of them are better yes. But with like 20 SSRs in there, and many of them being garbage, how likely is it that you'll hit that many of the same?
If you ask me, unless you spend thousands of dollars on the game (per month), don't bother with the SSR Eidolon guaranteed gacha. It's just there to sucker people to buy it, as well as compliment whales for whom it's an alright deal.