Question on importance of stack size as it relates to EV

General question, but I play $25 and $50 6-max.

Here is a typical situation. Say at the $50 game... I find a good table maybe 3-4 donators and a passive or two. I run up a nice stacck say 120-150, which of course involves busting some of the donators.

Now the table texture/make-up changes, into a table with more "OK" players than donators. Think maybe 30/8/1 types and a couple players who may or may not be better than me. In other words If I opened up this table I probably would not sit as there would almost have to be a better one. Also if my stack were 50-70 I would move.

What does stack size (provided you play a big stack ok or at least not bad) do to your EV all other things being equal... in other words does it change a leave into a stay?

Sorry if this is a dumb question, I have thought about it and have some ideas, but I would like to hear what you guys think.

if i know a player sucks and im 200bb deep, i'm not going anywhere. to play deep stack poker you have to be confident in your game though.