Misread it. You should wait on those t4b's and r5 Star Lord. Actually I'm waiting on one t4b to max my Star Lord right now lol. AA should be your next upgrade after though
If your goal is the Collector, you want either Hulk or AA. SL is a great champ, but needs to keep a combo going to really excel. You can't do that against the Collector because of his unblockable specials. AA can cause significant damage before he gets to his special, but Hulk is one of the best choices imo for the Collector because of the ability to chain stuns together.
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Really just preference. Depends where you are in the game. If you want to do all the end game stuff def SL.