We are having a 12" x 9" x 6" cake, with buttercream icing.
The bottom layer is definitely going to be Red Velvet with buttercream (filling as well as outside)-it's what my Grandmother always used to make, my entire family loves it, and it's been my dream cake.

For the 9": Fiance is thinking chocolate with raspberry filling, my mom thinks it'd be better with strawberry filling...
6": something a little simpler-for those who may want something more traditional....marble cake with buttercream.
To add just one more slight complication.....Mom thinks that if we're doing something 'so fancy' for the bottom layer, we should make the center layer the marble with buttercream, and just have the top layer be the chocolate and fruity filling....
So my question(s) are these:
1. Does chocolate cake with strawberry or raspberry filling sound yummier?
2. Should the middle layer be the 'plain' layer, or the smallest layer?
Neither of these really matter to me, it's really just a popular opinion type of thing.....(we're also have a vintage-candy table, so plenty of sweets for everyone)
Thanks, ladies!!:)