2012 vs 2014 ferris

I am looking at two mowers right now.

2012 feris 52" pro
20hp engine
about 850 hrs

2014 ferris 52" pro
19.5 hp engine
about 150 hours

What would be the better buy. Someone told me that they don't make the hydros for the 2012 anymore and are very expensive to replace. any truth to that?

Is there something to look for on the hydros; a way to test them?

I'm good with engines, but have never delt with walk behinds before. Any help would be most appreciative.

Thanks in advance.

2012 vs 2014 ferris