Galan is the most powerful champ out of the 3, but he doesn't have as much utility as the other two. Personally I feel that Hulkling is an utility machine, with both offensive and defensive capabilities. At this point Galan is basically the new cgr, so I advise you to rank up Galan if your focus is on offense and Hulkling for utility in BGs. I can't wait to test out my r4 Galan in the Grandmaster's Gauntlet
Regardless of who is better, I'd say don't do cgr. He really won't get much benefit out of a damage increase I'd imagine, so I'd save him for later. I don't have galen but hulkling is consistently one of the best champs in battlegrounds and really good outside too.
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Hulking though.