the lower the gear the lower your top speed is going to be, you will run out of gear alot faster with 410s..those being the lower gears..so your top speed is going to be lower with 410s but when you race you will have the advantage because of the amount of torque you will get out of them, 373s are just good all around daily driver and race gears, there not to low but there not to high, there just about right, i have 373s an i love them, with 410s you will be shifting alot quicker and possibly even using 5th gear on regular roads, my friend has 410s an he uses 5th on normal roads when its usually just for highway use. price wise they are all about the same from ford motorsports. gears make a huge difference in acceleration, so if your looking to win races easier and your car isnt an all the time driver where you have to commute then get 410s but if your always commuting an driving around just go with the 373s.