Pipette pumps durability
Syringe pipette pump. 

Tri-valve is not as easy to use as syringe one. And the little metal sphere in it can be thrown while using. The syringe is more comfortable, it is just required to have 3 types for different volumes.

Additionally, when the pipette is broken at the top or has similar problems, you can somehow adapt the syringe, like inserting pipette deeper or tightening the syringe. It is also not expensive and easy to find from others when you need more.