It's a tie in my world. Spinner lasts longer on a charge, Twist has a longer cutoff, which I often need as my Nova heads age. It's irritating to see the button flashing at the end of a long pull. But I dropped the Twist and its button is wonked, so that is also irritating.
I put dots of different-colored CHEAP ($1) nail polish on the Twist dial so I don't need glasses to adjust the voltage. If it hadn't broken, I think I'd still like it because of the cutoff.
I really wish I could get the mah on something with replaceable batteries in a Spinner size. At home I just use a LavaTube, and if it ever dies I'll upgrade to something with a better quality -- the finish is rubbing off of my LavaTube and I had to re-glue the end cap cover, I almost lost it, and it is needed in order to unscrew the cap to replaced the battery. But really the ONLY thing I like about the LavaTube is I can replace the battery without having to change heads, and I can carry spares easily.
However, I'm on a business trip in Europe and I made the mistake of getting a charger for my 18650s that doesn't work in 220v, so I'm using the Spinner this week and I'm liking it a lot. (kgos and the broken ego for backup)