Regardless of punctuation and whatnot, I did not understand what the question is...
You cannot be "considered" a twink. You are or you are not, I don't think there's a lot of variation on the term. So for the sake of the conversation, I'll assure you are.
I also assume your main is Alliance since you said you just started Horde.
I'll also assume your main is that 29 twink you're talking about in your title.
I have no idea what class your main is.
I have no idea what class your new Horde character is, but I'll assume Druid since you posted here.
I have no idea how you could get geared for 60-70 by being a twink, except to farm marks to get geared later... but you can farm marks at any time so I dunno...
Regardless of all that, here are my thoughts: Play whatever you think is more fun. How could people on a forum know what's best for you with so little details? O_o