If you're looking for differences in sound, then you'll notice much more difference from changing speakers, tubes, and transformers, or modding the circuit to change voltages than you will from changing caps. That said, there are subtle differences from changing caps. The brand doesn't really matter though as long as any brand you are using is good quality. What matters more is the composition of the cap. Orange Drops come in film/foil polypropylene (715P and 716P) and film/foil polyester (6PS, 225P). Torres's "Orange Drops" are probably very similar to the others and I wouldn't bother honestly. Mallory 150's are metallized polyester. Sozo's are film/foil polyester, etc. Polyester caps tend to sound rounder and browner than polypropylene, with less highs. For a guitar amp, polyester are usually better to my ears, but for bass or hi-fi, polypropylene can sound better in certain places. The old paper caps tend to leak DC, and if they don't now will eventually, but they can sound really good too. Theres also paper-in-oil, military NOS sealed paper caps which will probably outlast all other paper types.
Best advice would be to get various composition caps and try them out yourself and see what works for you.