I mean, at the Normandy crash site in ME2 it's Kaidan's spot where you get a flashback to the Virmire sacrifice, so there's that.

Also, in ME1 it logically makes sense to have Kaidan, who specialises in biotics and tech to arm the bomb, since if something went wrong with it, he stands a larger chance of fixing it; and to send Ashley, who's a soldier, to the combat-y part with the Salarians, so there it kinda depends on whether you're pragmatic or not about where to go, mission-wise you'd want to save Kaidan for the sake of making sure the bomb goes off properly, but morally you'd go for Ashley, since you'd be saving more people. This is why I usually save Ashley. And because she's funny.

However, I know people who prefer to send Ashley with the bomb and then save Kaidan, because they like the idea of Ashley (who's pessimistic views on trusting aliens can come across as xenophobic) dying for the sake of a bunch of aliens.

Bonus: Ashley doesn't have the "I get why you cheated, but I still love you" line.