Just some fill in info . . Our yard is hills of good size and gardens and some flat areas. So these are some I considered (the kubota and the massey choices prior listed).
To me . . A pull behind lawn deck is a no go on the hills and around contours of flower beds . . And 60 inch decks to my needs . . are too big and too likely to scalp on hill rises or make difficult access to tight areas. The
bx1870-1 is the only current kubota bx model that can have both a finish deck in the 48 inch size as well as a mulching option. it has full rops and a fel and 3pt. Its slightly physically smaller than the
bx2370-1 etc.. and has the traditional right side chute.
The massey gc1715 with a unique mulcher deck ended up being my final choice because its turning radius compared to the
bx1870 was about equal (both VERY manueverable). I tested both on sidehills and liked the fit and feel for stability just a little better related to hills . . And seat sizing and control access just a little more room. And it was a bigger engine/hp. Again full rops and I liked the more traditional left right hydro pedals compared to treadle (easier on my knee). Also 2 hydro pumps instead of 1 and same "front blow" radiator concept as kubota.
But that massey mulcher deck is unlike any other . . Its 6 blades instead of 3 and there is no exhaust chute at all. I can go up or down the hills next to rock gardens or flower beds and still keep them clean. Just as importantly with no chute . . Thus 54 inch deck is 54 inches . . Not 54 inches plus 8 or 9 more for chute.
We all choose for different reasons . . sounds like you have a smart wife and her desires. Lol
My choices are some of many out there.