wah, Sanyo come out with so many types of rechargable batteries?!

now really confuse, what to buy???

Sanyo NiMH Eneloop 2000mAh low self-discharge battery
http://neasia.nikkeibp.com/neasia/003046
so how does this slow self-discharge affect the usage?

using eneloop and a 2500mAH on a same device, does eneloop last longer?