Maple has a bright tone as a whole ; on a Jumbo guitar it's usually bright like clear, I'd say (with my limited vocabulary). In can be too bright on smaller guitars according to a (quite) general statement, but has enough low end on larger body sizes ; listen to Harrison's 'Here Comes The Sun' played live (Bangla Desh Concert), it sounds about perfect IMO...Thats a Gibson J-200 (Jumbo). My Taylor (Grand Auditorium) sounds a tad too bright at times...
A Rosewood guitar does have more low end (and sounds 'rounder'); but can it be too much ? I'm not sure, as I've never played a RW Jumbo ; on my Martin with an Adirondack top, that gives extra clear highs, I never get too much bass, I'm sure of that...
How can this apply to 2 Jumbos guitars? I wouldn't be able to tell ; however, if the RW guitar has a solid (flat back) and the Maple has a (laminated) arched back I would take a chance on the Rosewood, I'd say. But that's not from having compared them live. I have played a Guild Maple Jumbo that a friend had (arched back) and it sounded
very good (and was my 1st reason for jumping on the Taylor I now have, when seeing it [2nd hand] in a shop)...
Good luck (I think any of them two would be a nice guitar to have)...