I had never really thought about it until you asked.
I have only started a couple of years ago, so easier Munros with clear paths and simple navigation were first in my list.
I live abroad and tackle the hills in shorts spurts of a week or 10 days when I'm over. Therefore, logistics of having a few within easy distance related to a single accommodation was the next criteria. For example, Lawers range seems easy and logistically accessible staying in Killin for a few days.
Next came views and enjoyment of the walk. Once l got a bit more comfortable this became more of a driver than "easy" but logistics still influenced me.
Once l thought about it more, l realized l am also influenced by advertising and "sex appeal". Commonly photographed in all the calendars seems to entice me. The Bookle, Nevis, An Teallach, Liathach all started to appear on my wanna do list.
I hadn't thought about any of this before your question but all of them clearly formed part of my decision making
Thanks for prompting me to think about it. It's better to do the planning consciously than subconsciously.