The DVI does Not have the same output as a HH or MM 135 when the DVI running at 115 V, 45A difference to be exact at the same Duty Cycle. The Passport is more rounded machine if you want a machine that does both 115/230 V, that and its very portable. The 210 is still the best out of all these performance-wise, if you Need it.
Hobart 135:
115 V: 135A, 20% Duty Cycle
Miller DVI:
230 V operation: 150A at 23 VDC, 40% Duty Cycle
115 V operation: 90A at 18 VDC, 20% Duty Cycle
Miller Passport:
230 V operation: 150 A at 21.5 V, 20% Duty Cycle
115 V operation: 110 A at 19.5 V, 20% Duty Cycle
Miller 210:
230 V: 160 Amps at 24.5 VDC, 60% duty cycle