To be honest, it's gonna be difficult for anyone else to help you in your dilemma without them knowing what you're looking for in such a watch. Thus, without having the benefit of knowing such details, if I were placed in your place, I'd choose the Seiko over the Longines. Having said that, it's a bit unfair for them to be compared actually because they're not in the same basket. One is a pure diver while the other is, as G.MAC put it, a dress diver.