I am known to my friends as being a modernist.
I would take the newer version of a watch most of the time.
Some will prefer the older iteration... it's a personal thing.
As for the 16610 vs 116610, I own the closest to these 2 models.
The 14060 and 114060

This is the 14060... sharper lugs.
Streamlined case.
Anodized aluminium bezel (cheap to replace)
Hollow bracelet midlinks.
Stamped sheetmetal clasp.
Some see this as a disadvantage as it feels flimsy.
The advantage is it will work problem free.

This is the 114060.
Chunkier case.
Maxi dial and hands.
Updated caliber with parachrom blue hairspring.
Cerechrom bezel (expensive to replace)
Solid links all round for the bracelet.
Updated clasp with quite complex construction.
Gridelock extension is really good and practical.
If you asked me if the new is worth the extra dough?
I would say yes.
The old one? Value for money.
A good buy for and entry level sports Rolex.