Not being a ground fighter, I might be using terms incorrectly, but this is more or less what I was meaning by a triangle from guard. I'm saying that say you are the guy in the gi, and realize you need to be vertical ASAP, it's far easier for the guy in the t-shirt to keep you there for a few seconds until your head gets stomped. intentionally or just by struggling out of panic. (Steven something-or-other?)
My point being that, from my personal background of preferring to be on my feet, I am much more capable at getting back n my feet swiftly from a triangle from some form of back control, at east in my experience, more like in this second image.
So yeah, I've probably got the terminology all screwy from a BJJ perspective, but these are the chokes/positions I'm referring to. I feel a heck of a lot safer in the second version, both from the guy getting choked and from anyone else who might be looking for a chance to play kickball with me ol' noggin!
But also, if you've pulled guard, (forgive me if this is a noob question) but how do you just "let go and stand up?" It may be a dominant position especially in a grappling-only rule-set, but for most of us non-grapplers, "letting go and then just standing up" relies
either on the guy just letting us through good will, or on otherwise disentangling yourself first, either of which takes valuable seconds...