The difference between the comfort 10 degree and Sport 21 degree stem is that the Comfort has a shorter reach. Both are adjustable in height and adjustable in two 2 different reach values (there is about 20mm difference in reach between the two position).

The Comfort stem is mainly used by short people while the Sport fits for tall people, with 1m90 you should choose he Sport stem that you will be able to put on a high position if you do not like a sporty position.

The seatpost should fit for 1m90.

I strongly advise to choose the latest version Birdy III.