Cheaper units are almost certainly not indicative of something being a better investment, I'd say the opposite is more often true: ex. penny stocks or any of the long-tail cryptocurrencies that trade at fractions of a penny.
Especially for low-priced cryptocurrency, the marketing pitch of "it's like bitcoin for $1" could be very appealing, if you spread it on Reddit and other forums.
So from a pump-and-dump perspective it may be more promising.
If you went back a decade in time while you were at it, maybe. But there's been such a relentless tide of cryptocurrency-related scams being spammed on forum boards since Bitcoin hit popular awareness that the only thing I can think of that would be less appealing is someone trying to flog discount pharmaceuticals.
A $1 increase on a $1 investment is already a 100% return. And it's much easier to imagine a coin to go from $1 to $2 then it is to go from $20k to $40k.
no. it goes down to 8 decimal places. (a satoshi)