My observations,

On the single push rod Y support only at the rear will allow the metal rods to twist and bow between where they join the push rod and the control horn, this is why most used 4-40 rods to try and solve this and also adds weight to the rear of the fuse. Also once the aft support tube is in it must be perfectly aligned with the servo or binding occurs, this can also happen in high G situations. Easy to change a servo.

The shorter Y with the bearings in the fuse sides is lighter and places the bearing surface much wider and therefore more stable. Easy to change a servo.

I do like the deps system and if building a wood Fuse is the one I'd most likely use. It is a major PITA to get true in a built fuse. It is also fussy to get right. Changing a servo is cake.

The best overall system for stiffness is twin servos in the tail, only draw back is that much weight that far back and the fact you have to re trim the elevators if you have to change a servo. This system while a PITA to change a servo has saved me one plane so far when one elev servo died.

I've used the pull-pull on elev and while it is the lightest, it's far fussier to setup and can change as time goes by. Easy to change a servo if need be. Not one I'd ever use again.

Twin push rods using twin servos at the front is easy to install but redundant. Heavy as well.

The MK bell crank is not even a player in my book, this syetm has the most slop of any system in my exp.

All in all every system has it's plus and minus. Pick what works for you.