I would not bother with Tahoe unless you don't want to be tied to just one TV like I am ( have to get my wife's permission to take one)
Both trucks are pretty much the same in their basic design and specifications. I am not a big fan of 4 speed transmission but with 8 cylinders and not very heavy trailer this may work. If your Buick does the job that is ok, if not- I don't see how the Tahoe can help, it may provide slightly more payload however.
Gene//////'16 Passport 2670 BH
'11 Mercedes ML 350 gas, Reinforced OEM hitch receiver,1000 lb Eaz-Lift with custom welded head, 2 sway control bars, P2, tst 507 trailer TPMS