/me was booting backups of ps1 games with his gameshark 5 years ago, what's your point? lol. In any case, yeah a lot of people prefer codebreaker over gs. As far as I'm concerned I've never had a problem with a gameshark, and I've never had a problem with not finding a code if I happen to need one for my gamesharks/action replays (cause they are the same thing afterall).
If I was you, I'd go with whichever you feel more comfortable with, or whichever is available in your area. Hell, with how cheap dcast stuff has gotten... you might as well get both lol.