I would choose Minato, better to deal damage, has dodge, can reset and stack damage, he will be perfect for you in this range of power, not to mention you can level his mystery later on, gaara suit has a better role as a support generating combo immunity for those who have a shield, it can be a good one, but the tender gaara is much more cir*stantial than Minato, so I would go with Minato.

Hope this helps.