They still have propeller driven planes in service still?
For Argentina they do.
Strykers have very weak armor and no unique gun system (besides the MGS which is not very effective against most things).
And they're wheeled. Tracked vehicles are vastly superior to wheeled vehicles.
I think they're wheeled so they have more mobility, but yes tracked vehicles are superior. Stryker are supposed to be weaker than an MBT, they're meant as a fast APC, and the MGS basically has the same armament as the original M1 Abrams. There's also Mortar Carrier Strykers and ATGM Strykers.
LAV's are wheeled too.