I've tried a lot of batteries over the years and with the Orion brand I'd rank them:
1. 750SHO
2. 900HV
3. 1100RT- not a fan of these at all

I've used the Atomic 800 and they are pretty good, comparable to Orion 900HV. My current battery of choice is the TRP rp747. It's similar to the 750SHO which were a favorite of mine for years. I've tried the Peak, GP, Duracell, eveready, energizer and no name NIMH batteries too.

I have a DIY track made with the foam tiles (18'x17' with Trackmate timing system). The cars work best with soft compound tires (foams and some PN carpet tires work), our preference has been the Atomic 10 degree for front and rear. There are a few tread patterns to choose from.