2005 was the first year with throttle by wire if that's important to you. 2006 had a rudder upgrade. 2003 was the first year that the hooked hull was standard on all production 190/197. Powerslot (gear reduction) is always an improvement, but not absolutely necessary. All else being equal, I would take the boat with gear reduction.
MCX seems to be pretty reliable, but they have had quite a few issues with the fuel pumps burning up. Consumption is probably about average.
Previous: 1993 Prostar 205
Red 1998 Ski Nautique, PCM GT40, 310 hp, , Acme 4 blade, Perfect Pass SG/Zbox.
Be kind. Have fun.