The excellence is the previous model, that was replaced this year. Main differences are materials and weight. Excellence is leather boot and thick leather sole that requires waterproofing. Electra is microfiber, more padding, thin synthetic soles, lighter weight.
Why are you doing all this on your own? You can't fit and mount your own skates. Go to a risport dealer and have them order you a pair so you can try them out. The only thing to search out online is your nearest dealer, which is easy: distort.com/dealers. You are working too hard.