I'm have a choice of either:

1. An enclosed steel container where the car will be untouched, but not temperature controlled and is a cheaper monthly option.

2. Mass storage facility for race cars, temp controlled/secure but I have to leave the key which means the car may be moved and/or started through the duration?

The facility is an open space no garage units.

Main concern is avoiding any corrosion or deposits etc... price difference is minimal.

 

Go with #2.

 

I'm actually going with the container. I'm still concerned with the cold, but It's cheaper and I don't like the idea of leaving my car in an open garage where others will be in and out constantly and having to leave the keys.