I tend to be smaller than most of my partners and what works best for me is to transition more rather than try to control for long periods.
See, this is fundamentally what I disagree with, though I am a proponent on the movement mentality.
Where my opinion diverges of course is I am not actively
looking to transition more. If I can control the position successfully, I will do so for as long as I can maintain it and set up submissions from there utilizing the control I have established.
Transitioning for the sake of transitioning because the person is stronger is less than ideal for me. First, it is a losing mentality that implies in my own mind that I
cannot control this person. This is false, control is absolutely possible. Simply watching my own black belt instructor control top on a big strong guy is evidence enough of that.
I'd much rather figure out how I
can control the larger stronger person, with the concession that this person is larger and stronger, hence necessitate my use of movement as well. However, I want to transition to another position of complete control, where I am again seeking to maintain that control, and to only seek that movement when the control I had previously has failed, or is going to fail.
It's like when they say if you feel your closed guard being broken open, to open it on your own terms to try to stay ahead of the game. If I am working on closed guard, and my closed guard is not being broken, I just continue to play closed guard.
If I am working knee on belly, and they cannot or are not escaping, I will continue to work my knee on belly.
Any time I transition without purpose I am opening an opportunity for my partner to escape or reverse, and the last thing I want is to get caught in a reversal and stuck under side control or in half guard against a big guy.
Back to the bold point, transitioning is not something to pursue in and of itself. It is a component of trying to control someone. For me, control is a combination of applied pressure and purposeful transitioning.
Movement for the sake of movement itself, trying to use speed and confusion to get an upper hand is what I would consider scrambling, and although useful when necessary, not something I would actively pursue as a strategy. At some point that scramble needs to settle down into control, and quickly.
tl;dr Control is a priority. Transitions are a component of control which enable maintenance when control is threatened.