I ran mainly 1/10th because I thought 1/8th wasn't affordable. However I was able to pick up a 1/8 slightly used for much less than what I invested in my 1/10th setup.
One thing for sure 1/8th is more durable than 1/10th.
Crash survivability is non-existant in 1/10th. You crash in 1/10th you're done. You crash in 1/8th, you can most likely bounce back and stay in the game.
Also, on the track, the 1/8th looks right where 1/10th looks so small its almost like a mini car on the track.
Once I moved to 1/8th, I had to give up my 1/10th because I only have time and resources for one. I'm sure many others have made the same decision when they transitioned from 1/10th to 1/8th.