I'm looking at a 2x standard right now. But I've got the 410 which has the coax, and it's nice that it's there, so honestly I'd say go for the stack w/ the coax. I would.@Count Bassie Rog, if you had a choice between one coax and one standard Bag End 15 or a pair of standards, what stack would you choose?
That whizzer cone relies more on natural acoustics I think- it's the same structure of driver, and the highs seem more consistent with the nature of the other drivers in the cab. They're not sizzly or annoying like the old SWR Foster horns or those bullet tweeters.
I'd do the coax.