if you have a lot of retraction I would use the traction device first. Restorex was developed for peyronies disease. It’s not really a lengthening device but I’m sure that would be a side benefit. I really like the Penimaster Pro I think it’s an excellent product.
restorex is used for length also as i understand and the biggest benefit is that it delivers more traction and you need to wear it less time
if i would have average length (15cm I think or about 6in) then i wouldnt worry but now my length is 13cm/5in and for example when doing cowgirl i think that the girl cant move up and down much)