I would go Nocaster. It has a little syrupy compression on the attack that would lend itself well to funk. Nashville will be more of an as-is attack. Both good pickups. I like A3 better for just about everything though.
I'm in agreement with the Nocaster. I mostly play blues, R&B, funk, rock, etc., and I find Rob's Nocaster to be as versatile as any Tele bridge pickup that I've ever played. While an A3 magnet is indeed a bit weaker than an A2 or especially an A5, the Nocaster is still a pretty hot pickup in the overall scheme of things. Of course, the amp that you're using will make a significant difference as well.