Hey Bob, hey Dave @circuitbug,
yes, and longer life. With 80 mm you can’t do much wrong. There is room for the good ingredients.
But the decision whether ER16 or ER20 collet must be found based on your needs and requirements. It’s hard to decide if you don’t have the experience. One can not generally say this is better.
If you want to ask others specifically for the ER16 and ER20 decision, a more general CNC forum would be better than this one specifically for Onefinity CNC, which has only few members. Most CNC fora I know are in german, but there is https://www.cnczone.com/forums/ in english.
As for my decision to the ER16/ER20 choice, I I described it here. Why 65 mm spindle has disadvantages here and here.
If you buy the same things as Jim @Webb, you may have a look at if he’s going to get it to work!