The Mig-15 reflects Soviet thinking of the time.
No frills, simple.
May even be called 'rough around the edges.'
It wasn't made to be pretty.
It was made to fly, shoot stuff down, get home and easy to train on.
27MM and 37MM cannons are devastating.
The F-86 on the other hand was more refined in construction and reflects different thinking of East and West at the time.
Having flown both the F-86 and Mig-15, I prefer the Mig, but that is just a personal thing.
IMHO the Mig has advantage at altitude and climb, but roll rate decreases with speed.
The Sabre seems a bit more responsive at lower altitudes and has a better roll rate at all speeds.
I think the biggest disadvantage with the Sabre is time on target.
With the 50cal guns, have to put a lot of rounds in the target to take it down.
With the Mig's cannons, shorter time on target,:
One or two rounds into the target and it goes down.