No experience with Shorai. I have read mixed, mostly positive comments. Personally I always buy Yuasa, though on Wifey's Sherpa we went to a more powerful Yuasa battery than the original spec model due to the strains of cold starting + heated gear. Since batteries keep getting smaller, we got more power that still fit in the same space. FWIW - we keep our bikes on Battery Tender Juniors when parked at home. In case you do the same, note that Shorai batteries require different chargers.