What is best?
If everyone agreed on that, there would only be one brand.
It depends on whether you are using it for sex only, deformity treatment only, or a combination.
Using for both. Soma products good?
Soma units are good, you can get 4 different diameter sizes (that fit the one size pump) which will cover most activities.
I used pumps occasionally when I wanted to maintain a better erection, and from my experience I can say they are pretty useful for that purpose. My erection was really stronger. As for increasing size, I think it is just a fiction.
I used this (https://joynights.org/best-penis-pump/) one and I am pretty satisfied with it.