OK, to answer properly, I haven't used those specific chairs but I have had one like the Mimzy with the padding all over and I'd strongly advise not to use one like that, it will be a nightmare to clean especially if you get little cracks in the padding.
Re the Nup nup or nip nip, you really, really don't need to it recline (in fact it's dangerous to give food to a baby/child when they're not fully upright) and you don't need the footrest thing either, just one more thing to clean and for them to muck about on when they're bigger.
Honestly, the antilop looks basic but it really is a godsend to be able to clean it easily, strap in easily, and have the inflatable insert which can be removed or replaced. You really need something you can just wipe not muck about putting in a washing machine 
Both of them look big for a baby too whereas the Antilop is nice and snug.
I'd say the only downside of the Antilop is the legs stick out slightly and you end up kicking them, and you can't quickly fold it up but you use it so often you probably wouldn't need to (and it disassembles for travel).
OP I did look at fancy ones thinking 'my baby will have better than the basic ikea one' but having tried others they were a massive pain in the arse, impractical, and the ikea one is brilliant. The only other one I've seen people recommend is the Stokke trip trap.