About to book a 2-4-1 J trip in October.

Looks like its a 747 back but there is availability on the way out on a 747 or A380.

747 at 10:25 and the A380 at 16:05

I've been in both products and can't say I could tell the difference.

I can't make my mind up, anything I am missing?

Anyone got any other Chicago tips whilst I am here?

Thanks, be gentle please