Barbless aren't usually an issue on slower lowland rivers. However, those fishing the higher, faster and shallower reaches of rivers might not be so keen to go barbless. Trout, grayling and, to a lesser extent, dace in rapid water can be more than a little difficult a prospect on barbless hooks. Anyone that can guarantee to keep a tight line to a trout or grayling that's going ballistic is a lot luckier than I'll ever be.
Ultimately, the choice is yours. Give barbless a whirl. If you have no issues, all well and good. If you do lose a few too many, and your conscience allows, try a barbed hook. However, bear in mind that chub are absolute masters at transferring any type of hook to underwater vegetation. It happens often enough even with barbed hooks.