Your post is so vague that it's hard to give an insightful answer. You might have mentioned some of your likes or dislikes as examples of what you're hoping to get opinions on. Just FYI for next time or follow up comments to this thread.
Eerily similar to L0n3N1nja I don't have the S21 and I gave up Messages+ around a year ago when RSC really started hitting. It was a really great app, ironically being a Verizon product. I miss the auto reply when connected to BT in my car. The chat bubbles and customizations were useful and nice as well.
Trying to think of something I didn't like about it but after year I only remember the good times.