The advice above for the L35 is good as they are strong units. I also concur with MarkV on the B21.
During my tractor hunt I checked out the L2500/3000 series as well the L3010 w/BH before choosing the B21TLB. Why? The lift capacity is 926 vs 1050 lbs, the BH has higher ratings than the L3010 subframe BH(which lowers grd clearance), and the integrated package is meant for tough use over rocks, stumps and in tight quarters.
In addition the changeover time for the BH to other implements is easy and no subframe to deal with. The con's are no MM mower and no removable loader.
You will find too that the lift over height will be an issue for most units. The B21 is 88", the L3010 is 98" and the L35TLB is 105" max height. This means that the B21 can't load commercial trucks (10-16 yd size) effectively which typically have a 7-8' liftover height.
On the other hand you will need to tow this combination to a job site, and a 16'+ trailer with brakes, for the L3010 w/ BH or the B21TLB. While a 3/4 ton unit would work well, the best solution is probably a 350/3500 series dump truck. For the larger L35 units the larger is probably the best.
So personally, I favor the smaller TLB's for rugged construction, ingress/egress to tight quarters (the subframe BH add length) as well ease of removal and reattachment of implements.
Enjoy the hunt, and keep us posted on your continued quest for the right tractor!!
Carl