They both charge 10 sek (USD 1.1) to unlock, where VOI charges 0.165 and Lime charges 0.330 per minute.
Bus stops are everywhere and a single ticket costs $2.75 where a 24 hour ticket in the same city zone costs $5.50 (so you always get this if returning), in addition to 25% off any rider in addition to the first on the ticket.
Riding to work (5 min) and back from the grocery store to home (another 5) costs me $5.5 on a Lime, the same as the bus which allows me to ride anywhere for 24 hours, and $3.86 on a VOI.
For any distances longer than that I'd rather take the bus, since it's warm, comfortable and a notably safer ride.