I use a CTEC and I swap it every couple of weeks between various 'vehicles' over the winter period and it makes a massive difference regarding battery life.
I have vehicles that are stored for 4 to 5months of the winter period that that are 10 years old and still on the original battery.
As I see it, it's a no brainer......Keep your batteries in good condition, using a high quality electronic charger or keep having to buy new batteries.
Batteries that sit in a low voltage state, become weak batteries. Weak batteries die young. It's as simple as that.
Modern vehicles require batteries to be in a good state of charge in order for the electronic system to function correctly. They are generally, battery hungry.