Question about Dell S2721DGFA

I think it’s really good with high frame rate and 2k resolution.

Yes, it's not bad - but for a 5.-- (föiflliber) more you get a 4K from Dell:
Dell S2721QS (27 ", 3840 x 2160 Pixels)
My wife bought it the other day and likes it a lot, she works with it every day (win and mac) - it doesn't have any built-in speakers, but she's fine with notebook speakers.
Thin edge, pleasant picture ...
LG

What others are there for this price with this performance?

I don't know if it's the best, but we are very satisfied. Small edge and good picture. My daughter uses it every day and has not found anything wrong with it so far.