Hi Manny. Remind us again of the lathe it will be used with.
Vicmarc- thumbs up! My 25 year old VM120 is bombproof. (I also have 2 Talon chucks which are great on my 12" lathe.)
Chomping down my lunch and thinking about this, I've boiled down chuck choices this way: 12" swing and smaller, and 1hp and less, and 1" spindle size, go with the smaller VM100 chuck. Over 12" and greater than 1hp, and increased spindle sizes, go with the VM120 chuck. This is the same rationale Oneway had in the later-90s when they introduced the Talon (VM100 competitor), designing it for the mini lathe market. A Stronghold on a Jet Mini lathe was like driving 10d nails with a 4lb maul... Same with a Vic VM120.
The VM120 weighs 8 pounds before jaws, and shark jaws get heavy fast as their size increases. 10-12 pounds total, a lot of rotational weight for the smaller motors, and there's no wood yet. Or tools cutting the wood.
If you've been watching Richard Raffan videos where for the past few years he was turning on the 12" VL150 lathe, he used the smaller VM100 chucks (4'ish pounds for the chuck body). When he stepped up to the larger 16" VL200 lathe and its stronger motor, he also invested in the larger VM120 chucks.
Raffan really shows how to get the best grip performance from the Vicmarc jaw sets. You can't go wrong with Vicmarc.