Errr, I hate to criticize, being I'm not the best bass player myself, but the first guy is not that great. He may get better, but he isn't keeping time real well and you can tell he makes several mistakes. (His bass is not tuned to the song either, I don't care what excuse he used)
You can see him trying to concentrate really hard on keeping rhythm with the song, which gives him away as not being as experienced as he puts on in his comments, unless he's just not enjoying it, which I doubt he'd post a video if that were the case.
He needs a lot more practice. It's kind of half assed (kind of like when I play guitar, lol).
The 2nd kid is actually really good. He keeps time very well and also put a lot more passion into it. You can also tell he's put a hell of a lot of time into playing bass.