A flask works better if you try to do multi-step starters, it is easier to decant a erlenmeyer flask than a beaker. For a single step starter either should work fine.
Don't take any more faith in anything I say than you would anyone else on the internet. If you listen to what I say, then hurt your self or break something it is your own fault, I am just expressing my opinion or experience.
THINK for your self!!