2012 versus 2014

All Roadsters are ABS and production started late 2009 for 2010 release
 
Only one data point here matters: ABS.

Buy the ABS bike.

Since they both have it buy the one with a better maintenance history.
 
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Look on the rear wheel for a second disk with slots.

This one below is the front
 
Also the instrument cluster would have an ABS light.
 
my 2012 roadster has ABS .. check the 2012 for sale if it is really a 2012 in doubt buy the 2014 ... eventually you may also have to take the 2014 transmission to robinson's industries for back cutting and replacement of #4 gear several 2012 and newer have had the problem of gears separating intermittently while riding.
 

I have to agree with you about Amsoil, I've found that engine runs much quieter. Go for the 2014