I've grown Diesel Ryder but don't know about the Himalaya Blue yet because they're only a week old. Diesel Ryder rocks in my opinion, it's by far the strongest smoke I've had in my 11 years of smoking. They stay short about 12 inches and come out as one solid bud when I grow them under 2 125watt CFL's. The yield isn't as much as some of the auto's but personally I like them the best and would grow the every time if it wasn't for the smell. But like I said I've only just started growing the Himalaya Blue so I don't know about them yet. If I was to choose though a differen't auto that I havn't grown yet I'd try Himalaya Blue Diesel.