Welcome to the forum!
The '11 was the last year of the SV650 motor, the Gladius motor started in '12. I believe the difference is a bit more power at lower RPM's, slightly better gas mileage, and a heat exchanger instead of an oil cooler.
Is your '11 ABS? If so I'd lean that way.
I consider mileage and age, sometime low mileage old bikes can be bad, over time rubber components dry and crack, fuel systems get buggered up from sitting.
Not being mechanical I'd lean towards the '11.
2009 Wee Strom ABS (current)
1987 Harley FXR Low Rider Sport (current - with 206K miles)
2009 Aprilia Mana 850, 2006 SV650, 1984 Yamaha Virago 1000 (all sold)
Silver Strom Club Member #11
Wee Farkles: Russell Day Long Seat, Madstad with Moose Adventure Shield +4'', SWMotech Centerstand, 1'' up & back bar risers, Givi XS308 Tankbag, Aprilia mirrors, Framesliders, Fenda Extenda, Elka Shock.