I got so much more grief on alliance as a multiboxer that I highly doubt I'd ever go back. I also (generalization incoming; get your panty-unbunchers warmed up) found that my personality type agreed a lot more with the more muddy, gruff, mean-old-bastard feel of horde versus the teeny-bopper nitwits I generally encountered on alliance. I'm sure my tendency to view them that way caused me to be more aware of it, thus possibly inflating my observed data but whatever. That was my impression across two previous servers, so that was close enough for me.