you couldn't just keep your other thread going?
both sound like ideal beginner packages, personally i don't like squier, ibanez is also better known for playing metal than fender. as for upgrading it doesn't really work that way, i've seen people playing $100 pawn shop guitars and sounding fantastic and i've seen morons with $5000 guitars who had a hard time chugging out a zeppelin riff.
the amp might be a little small when trying to play over a metal band though, i'd advise setting it up on a chair and angling it upwards so that the sound is projected towards your heads rather than your feet.
so basically it comes down to the amp. from what i'm seeing and generalization on the brands, the ibanez is a light bass so it'll be neck heavy which means any time you let go of the neck it's going to swing towards your knee. the squier has a heavier body so it's less likely to drop as much if you relax your grip on the neck but it'll strain your shoulder a bit more. aside from that both basses will probably be pretty similar.