Go nasal. Both Semax and Selank were built and registered in Russia as intranasal drugs, not as injections.
I like them and think they are pretty avg on their own. Together in a blend or just take together is the best way to go. I literally just finished a round on a blend of these two. However if I had a clear choice I'd upgrade to Adamax / Adalank. They are considerably more expensive, but I think they are superior products. I would say try Semax / Selank first and see how you get on. Then take a few weeks off and try the Adamax / Adalank side. This will give you the best perspective and Selank / Semas and pretty cheap to run even as a short term N=1.