If I was starting from scratch, I would have 'top bee space' using National hives with 12" deep BB
I think sensible advice to give to an absolute beginner (who may not stick with the game) is to buy something that can easily be sold on, in the event that things don't work out.
So I would suggest (at the very beginning) avoiding non-standard 'refinements' - like top beespace on any National variant.
I also feel that such digressions are bound to confuse the beginner -- who likely doesn't know the difference between top and bottom beespace designs, let alone that he can in effect give a bog-standard national top beespace by simply using a framed wire queen excluder.
The only area where I would think non-standard *might* make sense is with material.
Especially if someone is not confident about putting together a flat-pack hive *accurately*, a ready-made hive can make sense for a first hive. However, they are not cheap.
Which means that a ready-made polystyrene foam hive (for roughly the cost of a wood flat-pack) would represent a smaller commitment (and a likely smaller financial loss in the event of baling out after the first year or two).
But (if going national or 14x12) do still invest in a proper (framed) qx and a proper (framed, see-through) cover board!
/// Oh, and moving from National to 14x12 is about as easy (for a newish beek) as any hive format change is likely to be.