Bitstamp's CEO, Nejc Kodrič, claims to have studied Information science and Economics and work experience as a marketing director
MTGox CEO Mark Karpeles has studied nothing, but had work experience in network administration and web development.
Comparing the CEO's, Nejc Kodrič looks far more competent.
Bitstamp is in Slovenia, which is an EU member, MTGox was in Japan.
I trust EU companies more, i've experienced that already with BFL and KNCMiner.
Sources:
http://si.linkedin.com/pub/nejc-kodri%C4%8D/47/227/299http://www.linkedin.com/in/karpeles