Not much, reputated brand, thats all,
Samsung evo is 5 years warranty and samsung pro is 10 years warranty,
If I was you, since you are upgrading a 2010 pc from hdd to ssd, I would pick a WD 480 GB thats cheap and very good value, super fast, WD is okay brand,
But to answer your questions, you can check all SSDs transfer rates speed, just compare read and write speed most of them are around the 500-550 mb range