So far I like the 2021, although it has a bit less HP, I have not felt any difference in performance. It may be because it has a 7 spd transmission instead of the 5 spd. It rides a lot quieter and of course it has a lot more bells & Whistles than my 2010. The big difference so far is the better fuel economy, but I guess that is to be expected going from a V6 to a 4 cyl Turbo. The model I purchased is the ST Line which gives it a bit of a sporty look without the peppy 6 cyl. I have two modified Mustangs for when I have the need for speed. The downside is that it's a new vehicle and we tend to baby her a bit more than the 2010. All in all, I am pleased. I enjoyed the 2010 SEL so much, I didn't hesitate in buying the newer one.