I have to admit I was really disappointed that Randall basically torpedoed Rebecca's chance of being hired as well. I think it was pretty obvious that Trump was going to hire both of them, and I think it was bizarre that he gave it to Randall to call that shot -- on live TV, with no prep. I thought it made Randall look selfish and inconsiderate. It's not like I can't understand the reasons behind it -- I mean, if you are looking at it strictly from a what's-best-for-me perspective, then it's certainly better for Randall's future to be the sole apprentice, the winner, the one who garners all the attention. But I think he would have had that anyway -- Rebecca would always have been the first runner-up. But at least she would have gotten a huge career boost, and I personally don't think it would have taken anything away from Randall.
I liked Randall all along, I predicted he'd win from the beginning. But I grew more and more impressed with Rebecca. And in my opinion, she would have been the better "apprentice", given that she IS young, relatively inexperienced, and just at the start of her career. If you look at it from the spirit of what an apprentice actually is, then she fits the bill better, rather than an eminently educated and already well-experienced businessman, which is what Randall is. He doesn't need to be anyone's apprentice -- he's already a huge success in his own right.
Anyway, that's my perspective. I do hope that Rebecca gets some huge boost out of the show, because she really impressed the hell out of me, and I think she deserves something.