To me, I'd think that driving an SUV would be best for both Uber and Lyft. The reasons being that they are more spacious, offer more features to help passengers relax, and are generally safer in all weather conditions.
Since gas prices have dropped so much, do you think there will be more of these kinds of vehicles out on the road? Could this mean and increase in people using either service because there is more room for multiple passengers?
This is not something I really thought about but I would imagine in some areas, this will be the case. SUVs, like you mentioned, offer more room and other perks for passengers other vehicles tend not to. There is also more space in the back if the passanger(s) has luggage or other items that they need to go with them.
I own an SUV and have been tempted to switch this over and use it as my main vehicle but I don't want to increase the millage on it. That is still a downside. Gas may be cheaper but an SUV with a lot of miles is a hard sell.
I wish I had kept mine but the gas prices will go back up, I am sure, but the end of summer. I drove an SUV for nearly 5 years and loved it but I just couldn't afford the gas prices when they were high. I sold it to my younger sister and got a more reliable and gas friendly vehicle.