I recommend you choose Spe+ out of the 2. It not only gives you a head start for speed but it also provides extra speed for your pair up with Cordelia (especially if you hard support using Berserker). I never want to -Ste or -Mag. Simply because if there is a need that Robin can fill, then they don't have to worry about penalties. I personally always go for -Def because it does not effect your skill, speed or mag/str. sure defense is a thing but in Apotheosis its one of those stats that don't matter unless you are building a Morgan tank. 9/10 that won't happen so focus on speed, skill, strength, and magic and play like it is a player phase game. best strategy I know.
