I bit the bullet!
Thanks to those who responded to my post. I made up my mind and went with the bike with 2.1 inch tires instead of the fat tired one. I just got home from the bike store and next week my bikes will be delivered to me. I use the plural because I bought a bike for my wife which is a Voltbike Elegant and I got a Voltbike Bravo for me. Neither of us have ever had an electric bike but after test riding these bikes we are so excited about our new toys. I really appreciate those who responded to my question regarding tire size.