Tow Vehicle Choice - Tundra or GX470

I just purchased a 2619 Trailmanor and own two vehicles that could serve as the tow vehicle. The first is a 2006 Toyota Tundra crew cab. The second is a 2005 Lexus GX470 SUV. Both appear to be capable of towing the TM. Is it just personal preference as to which one should serve primarily as the tow vehicle, or would one be superior? I need to pick up the TM soon and would like to wire only one of the two vehicles with the brake controller. Thanks