I see the EGO batteries offered and i als see they have spinner and a twist. I don't see any difference. is there one?

it seems the spinner is less expensive?
I own both.
Twist
Dial very narrow/ smooth and not easy to turn. Voltage numbers very hard to read/ invisible. Button occasionally sticks. My 650 the dial turns too easy. My 1000 dial is very tight/ hard to turn. Dial very smooth and narrow= hard to turn.
Spinner
Wide knurled voltage dial easy to turn and easy to read voltage markings. Just feels better than the Twist.
Size vs mah
1300 Vision Spinner- Length 113mm (4.4"). Diameter 16 mm.
1000 Twist- Length 120mm (4.75"). Diameter 14 mm.
Also own the 650 VV Kgo- don't like the button.
My fave, by far, is the Spinner.
i was wondering if the twist is any good ? does the twist mechanism twist by its self while its in your pocket ?