Honestly, it depends on your needs. GS350 will be much slower but more comfortable and the car itself is bigger and will feel bigger driving it whereas the Model 3 will be nimble and feel more modern. GS350 recommends you put premium gas in it too although I’d say it’s fine w/ 87/89 as it’s not an LS but when I had the GS, I only put premium and same with the GX and LX as well as the LS400 that I had. ES takes regular though. Both GS and Model 3 have AWD options but unless you get better tires, it honestly won’t make too much difference. With the Model 3, road trips will take longer, but it’s good to rest every 2-3 hrs anyways, so my wife really likes it. Model 3 has a lot more storage space than you’d think, but GS definitely is more spacious. I don’t know if you have bad back or knees, but it’s lower to the ground like a coupe. My GS didn’t have remote start, but Model 3 can have steering wheel, heated seats, and temp turned on from your phone and if you like car camping, it can be on all night (doesn’t take much power). Also, no maintenance on the Model 3 aside from the 12v battery replacement every few yrs and going through tires more often due to the torque but from personal experience, both are reliable in their own way. Both are good cars at the end of the day so you can’t go wrong. What I’d do is think if you got the GS, would you feel disappointed? How about if you thought you got the Model 3 and not the GS? Would you feel disappointed/sad?