The obvious stuff is obvious (price, newer Vs Older, etc.....) so I'll avoid those things.
IMO the following points are the big ones which will differentiate the bikes
New model
- Contemporary styling
- Faster, lighter, more riding tech.
- Will embarrass 99.9% of other bikes off the mark
Old model
- Bigger & chromier ( Classic cruiser look)
- Seriously triggering to Harley riders. Same style but bigger and badder, insanely faster
- Upsets wankers (or generates admiration) by looking like a massive cruiser but being faster than 98% of other bikes
Basically, do you want a crazy old school looking cruiser which will kill you, or do you want a contemporary muscle cruiser which is also insane and highly likely to kill you?