I will echo tony's incredulous reply... for the kids, yep the kid hey!
I have a ps2.
note that unless you mod the ps2 (which will void any warranty) you will only be able to play region 4. not sure about x-box's stance on this...
ps2 has more games avaliable than its MS counterpart.
as for games targeted at kids, the best platform is prolly nintendo.
I'd say go ps2 just because more of them are sold than any other console.