i have used both. started with sashimi then slowly started learning uc. they both do pretty much the same thing, in my opinion sashimi is much easier to pick up and use especially with the youtube tutorial, reason i start to lean towards uc was because it was something new to learn ( i always love challenges) and even though sashimi auto installs everything, you still have to prompt it after the first boot
afaik whereas uc runs while its booting. really a matter of opinion i guess but both get the job done well.