The Odyssey is very good but personally I think over priced for the additional benefit it offers. Mine was bought used from a friend (and doing fine thanks) making it ok on costs. But a Motobatt is 1/2 the cost and delivers a lot more than half the benefits.
IMO you are best to go cheap and cheerful and expect to replace it every 2 years or go the whole hog with something OTT like the Ballistic.
The Ballistic LiFePo is only worth having if you need the space saving (or want the bling). Otherwise there's not a lot of point.