I'm a HUGE fan of LTCO but just finished a cardi that has garter hems and opted for the crochet CO. I also like that it mimics the appearance of the regular 'chain' BO (thus, the CO and BO match) and is even referred to as 'the bind-off CO' in some refs. Being garter works very wide, you need to use a CO that has sufficient stretch. Knitted and cable COs look great (I use both where applicable) but they're known for their sturdiness and might not be wide enough to give elasticity. Altho you could work it in a larger ndl and then go down a sz or two for your garter sts.
Keeping to the knitting basics