[ebarker]

In terms of raw power, why would you choose a 550 over a 775 ?

In terms of durability, is the 775 better than a 550 ?

Peak efficiency data only is listed below, measurements at 12 VDC.

RS-775 - 119W, 11360 RPM, 12.5 A, 14.2 oz-in
RS-550 - 99W, 17100 RPM, 10,91 A, 7.9 oz-in
RS-540 - 49W, 14840 RPM, 5.85 A, 4.5 oz-in
RS-395 - 25W, 13110 RMP, 2.74 A, 2.6 oz-in