I don't know much about anything but I can tell you this, the LiPo batteries I've had never had any issues. And I would only start the bike every 3-4 months!! Never had anything bigger than a 4-cell either.
Having said that, they were all used on modern 600cc 4cyl sportbikes (CBR600RR road, R6 2007 race and now ZX6R2010 race). They dropped almost no charge over that period of time so I didn't even unplug them. And they ALWAYS started the bikes issues.
My ZX6R has an issue at the moment and it won't charge the battery... so last 4 track days I had to bring a charger/balancer with me just in case. Never needed it. I would charge the battery the night before and run it all day long, starting the bike before every session with no issues but then again I have no running lights/brake lights/blinkers/etc on that bike. I'd had to charge it again when I got home, obviously but I was impressed by how long they last on a bike fuel injected bike running a ton of electronics!
I have always had the Motolab batteries but I've also heard good things about the Shorai. If you do get the Motolab ones, make sure to order their charger/balancer too. It works really well and it only cost me $30 more from memory.
I have recently bought a CB500 and I think I'll be running the 8-cell on that bike. Or at least try!