I bought and tried quite a few.
the Empress Bass Compressor is easily the winner for me personally.
I use it at the start of my chain just to even out my playing a little without destroying the dynamics completely.
It can be transparent or can add colour depending on the settings.
The fact that it has separate input and output LEDs means you always have a much better idea, visually, of exactly what it’s doing.
Not cheap, but the most expensive part of buying the right compressor for me, was buying 3 or 4 before finding the one which suited me the most.
The ones I didn’t get to try which seem to be highly regarded are the Cali76 and the Keeley. Neither have the twin level LEDs, but I didn’t get to compare sounds so can’t say.
Compressors can be a difficult thing to get right, and opinions are subjective, so I wouldn’t recommend you buy it based on my say so. …But I would strongly recommend you try one if possible.