In May, a friend and I will be flying from SFO - VCE. On the portion to Europe, we will be flying on AA. To flying into VCE, we can either transit through MAD on IB or LHR on BA. Does anyone have an opinion on which option is more attractive? Based on hearsay, people seem to think OW => IB is a pain. Both layovers will be about 3 hours.