Hey I looked at your profile and looks like you are eager to get started !! Cool! Welcome!
it is a preference issue but there are some consistent issues that come up over time. I suggest you wear each device two weeks, no taking it off to clean your genitals.
Plastic gets pretty gross in term of cleaning: totally can clean it but it takes more time and effort in my opinion. Metal is just wayyy more comfy and easier to clean for long term wear for me, the weight isn’t an issue if you are buying good quality. Each device sets on there and pulls differently. The metal pulling as you describe is a function of the device having only one base ring or a narrow base ring. If the base ring is two or three steel rings or a tube like Evotion wearables, the device doesn’t tend to sag down the cock and balls as much. It’s all about proper fitting!
on cleaning: takes me at least 30 minutes to clean both my genitals and the plastic itself in a tight fitting cb6000; takes like 2 extra shower minutes in steel, and sooner or later, I always get chaffing in the plastic, very rare in steel.
what if you’re locked for months???
good luck!