I own a 2018 GT Perf. Package 1 with the 10 speed and like it very much. I did have two 6-speed manual Mustangs prior to this one and must admit I miss shifting gears. This is a tough choice as the 6-speed manual is the MT82 with a few changes and I always considered that transmission as less than adequate. If the new GTs would have had a Tremec transmission in them I would still be driving a manual. I say if you can afford the extra money buy the Bullitt, I still miss shifting the gears and if the Bullitt was a choice when I bought my '18 GT I would not have hesitated to get the 6-speed manual. If you always wanted a manual get it, you will be disappointed if you don't. I know the 10 speed is faster but do you really race the car or are you buying it to have fun driving it? The reason I went with the automatic was mostly due to my age, 67 when I bought the car, and just didn't know how long before I got tired of shifting myself, or unable. I still have regrets, occasionally, for not getting the manual. If you are younger and like to have fun driving, by all means, get the Bullitt if the extra cost will not strain your budget.