Tactical without a question, especially if you have smaller hands. I have both and as far as I am concerned, there is nothing gained with the Mark 23 and it does not fit my hand as well or point as naturally as the Tactical does. And the triggers in both of the Mark 23s that I have had (sold the safe queen) were not anywhere near as good as the standard match triggers in any of my 3 Tactical. Accuracy, I can't tell a lick of difference shooting off a rest, and off hand, I find the heavier pull on the Mark 23's trigger to make it less accurate than the Tactical, not more. At least not in my hands. Saying the Mark 23 is not that much bigger than the Tactical is the same as saying the Tactical is not that much bigger than the Compact. Bigger is bigger, and in the case of the Mark 23 versus the Tactical, you get nothing from that added size except weight.
If the Mark 23 held more rounds or gave you anything over the Tactical other than size and weight, I'd say get it, but facts being what they are, the Mark 23 brings nothing to the party other than bragging rights about having a $1800 night stand gun, and that is not a reason I would care to brag about.