Just for the sake of comparison;
------------------- 790------------TC-30
Displacement--------81.2-----------91.3 cubic inches
HP------------------27.0-----------30.0 nominal HP
PTO HP--------------24------------25.5 manual trans.*
Gear----------------8x2------------9x3
Brakes--------------dry------------wet
Hyd pump-----------9.9------------9.6 total gpm
Implement-----------5.6------------6.1
Steering-------------4.3------------3.5
Lift capacity---------815------------1635 Lbs, 24 inch aft of the hitch point
PTO system---------2stage live-----2stage live
weight 2WD, R1------1930-----------2193 Lbs
* TC-30 has Hydro trans option, 790 does not.
TC-30 has also higher FEL capacity.
790 is also 4" longer and 3" wider and both machine are nimble when it comes to tight corners.
No plastics in either tractor that I like a lot. I'll be happy with either one, but if I had to make a choice for under 30 hp, then I would have to go with TC-30.