Best training collars

Hey everyone, I have an 8 month old GSP. We have had a bit of a regression with him due to the phase of life he is in and I am wanting to back track and really reinforce some of the fundamentals while toning back on e collar use a little bit before reintroducing. Looking for tools to utilize during this and I found leather training collars (Best Gun Dogs brand specifically) that look like they could be exactly what I need. However I am having a difficult time finding any further information on how people like them for their dogs, if they’re effective, and if they’re worth it. Does anyone here have experience using one? How does it compare to something like the wonder lead? Also, is this whole thought process incorrect? This is my first time training a bird dog and I want to do right by him. TYIA