I never liked the air vent holders because they always blew hot air on to the device which seems very detrimental especially when charging. Cold can also be a bad thing but heat is a batteries biggest enemy. *Stepping down from the soapbox* Anyway, I have a window mounted phone clip that has very deep grips, meaning a thicker device could be held with ease. Some don't like the window mount types because they can, if not installed properly, obscure view and in climates that very widely fall off if not good quality or properly installed. I tend to go for the longer neck variety so that my phone rests at the edge of the dashboard, making it easier to get in and out of the holder and manipulate when needed. The short ones, in my opinion, hold the device too far away and cause me to reach too much if I need to touch the device. The dashboard mounted ones never work for me because I've never had a smooth dash. They tend to be the shorter reach ones or are designed to stand upright.
This model I found on eBay is similar to the type I'm talking about...
www.ebay.com/itm/123187715190 In the photos you can see what I mean by having it reach out to the edge of the dashboard too.