I killed three of the original Osprey bladders, they have a tendency to leak under pressure where the stiffener plate is stitched on, to be fair, Osprey replaced them FOC. They’ve completely redesigned them for this spring, so try and get a new one if you do go for Osprey.
Also, in some packs, the stiffened Osprey reservoir can dig into your lower back, which is uncomfortable, the Raptors had a tendency to do this ime, my Escapist is fine though, depends on the pack design and how it sits on your back.
I like the Source reservoirs with the massive opening at the top, but with an Osprey bite valve with the magnetic gubbins, which you can buy separately. Or a Camelbak valve, though they’re stupidly expensive.
The Platypus reservoir is decent, but the flow rate from the Platy bite-valve is lamentable, just sort of trickles out. Anyway…