it is definitely personal opinion thing.
I prefer the gym because i tell myself that if i go i will reward myself with sitting in the hot tub for 30 min or so after my workout. That usually gets me motivated.
Also, signing up for classes (yoga, dance, step, tai bo etc..) keeps you going because you are expected to be there- plus once you go you can't just stop after a bit. You have to stay til the class is over.
The only equip. i could see myself using at home is an ellip. Those things are magic! However, you already own (and i'm assuming; stay true to it) your own equipment. You have the motivation to do it at home so you would probably save money by buying the stuff you will use often and stick with that workout schedule.
i'm sorry i'm blabbering today...i'm such a wreck right now lol
"talent is wanting something hard enough to work for it" - my drama teacher :)