datitisev I'm not writing as a moderator or staff member here; this is just my personal opinion.
I'm not going to vote in your poll, because I'm not really equipped to make a judgement one way or another. There are a few people around here who could look at your work and give a valid opinion as to how you might best use your talents. But they're in the minority; so in the long run, the poll results will be meaningless. (Despite what the interweb would have us think, polls are often not the best way of deciding things.)
Ultimately you should be the one who decides how to use your time and energy. That's a decision you should never leave in the hands of others, if you can avoid it. In the professional world, there's often no way out: much of the time we're obliged to do what other people want us to. Insofar as you have the freedom to choose your own path, you should take advantage of that freedom, and relish it!
Weigh your choices carefully. Either way, you'll have the opportunity to learn new things. Either way, you'll have a chance to create something that others may find useful. What sort of things do you want to learn? How do you think your work can be most useful to others? More decisions that can really only be made by you ...
I will say that there's still a lot that needs to be done before Flarum is ready for release; and I know Toby and Franz are always happy to have more hands on deck. I'm sure you'd get a lot of satisfaction out of working on FlarumJS, but you shouldn't discount the things you can learn and accomplish by participating in a team effort. At the very least, you'll have an opportunity to see more of the thinking and planning that goes into Flarum. So even if you end up deciding, down the road, that you really need to create a Node-based Flarum, you'll have a better understanding of why Flarum is the way it is, and your work will be that much better informed.
But the choice is yours. If you decide you'd like to help out, it's easy enough to pitch in: go to the issue tracker, pick an interesting-looking issue marked "Good for New Contributors", and have at it! If you need help getting started or want to discuss approaches, join the appropriate Gitter channel and ask away.
ron_jeremy What a nice picture of Mr. Spock!