Which is better because I am in the Drivetrain upgrades and can coose between:
7.3 Speed
5.3 Handling
8.1 Accel
7.3 Launch
Stock
or
6.0 Speed
5.3 Handling
9.0 Accel
8.8 Launch
Thanks in advance 
Well it depends on what track and how the build is set up tbh. There are so many variable its hard to tell you which is better without knowing where you plan on driving it, what class, AWD/RWD. Stats can be very deceiving when you are just looking at them and not driving them. I have plenty of cars that i have built with fantastic stats on screen but on track the car is poop. I look at stats for just the initial build and then re build it from there.
But i guess to give you the answer to your question for just these numbers up there i would say the accel one for shorter tracks and the top one for speed tracks.
Stats aren’t really good to go by IMO- Try them both on the track. I would tend to go with acceleration. ( Launch is great for Drag) but proof is in the driving. Speed is a deceiving stat as long as the car doesn’t red line before a straight is over and it speed is comparable to the cars your racing a 6 is fine. I prefer RWD over AWD most the time so I would go with the top one, but just swap and drive them to see which works out best to you. It’s just credits - and if you do rivals or long races those are easy to come by.
get the race or sport tranny, it lets you trade speed for acceleration. if not for drag forget launch. for circuit racing you want acceleration and handling. get the forza aero wing and spoiler. it reduces the pi on most cars. its going to say it reduces speed and acccel but it wont if you adjust it. if you need more airo to get around the corners you’ve got it, if you dont reduce the aero to get more speed. you can reduce or add aero. depending on the class (lower) wider tires will be more than enough to keep the car on the track so you wont need sport or race tires. also go for weight reduction in the lower classes, it helps you climb hills and corner better as well as accelerate a little better. get a race suspension so you can adjust your springs, alignment etc…it has a low pi cost and can get more out of a car properly tuned than race tires.
those rating you see are for unadjusted parts, once you properly tune a car they dont change and are in correct. an upgraded but untuned car will have the same numbers and ratings as a well tuned car that can lap it.
By the looks of your numbers one is rwd the other is awd … With that said if the car is naturally rwd and you make it awd to gain acc and speed most the time without the right tune it’s a pain in the butt to deal with. A few cars achieve better lap times converted to awd but you have to tune them to basically drive like rwd. I race r class and always go with handling over speed on every track except lemans. Only way to know for sure is tune and test drive…lap after lap after lap