well we happen to own 2 of your 3 choices
the primma pappa - which is by peg perego here and in the states is one of the most popular ones here and very expensive (much more than i saw them for iin the states last visit which really p!ssed me off). i bought it 2nd hand as i was not willing to shell out $300+ and got it for $100. i hated it. i do not know how it is so popular here apart form the fact that we have a smaller selection to choose from. the main problem with this high chair is thatthe table part is so far away from the child (even when they are bigger - like 2-3 yo) that food gets in the seat everywhere and there are nooks and crannies in the edge of the tray that i was forveer having to clean out with a toothpick
if i missed anything it started to smell quite quickly.
unfortunately dd1 LOVED this chair and we kept her in it until march of this year. when we returned form a trip overseas i just directed her to sit at the dining table and we have since moved it into our laundry while i decide what to do with it.
since we needed 2 chairs i went and bought the antilop since a friend had recommended it last time. it was inexpensive, simply designed, is a dream to clean asd there are no crevices. i don't see this as a long term high chair though so we will either move liv to the primma p. or a booster seat in the next 3-6 mo.
HTH
BTW - i have never experienced the stokke first hand as they are VERY expensive here but if i had the cash i woudl rather that than the prima papa