Using a tent you have the opportunity to grow in a sterile environment whereas a closet will always have the chance of contamination, no matter how thoroughly you clean it. There's always a corner, or a crevice that spores can collect or beasties can hide. There's also the risk of mold and fungal spores living in woodwork/plaster work inside your closet.
Most tents come with hooks, brackets, poles, supports etc. strategically placed, or specialist tents obtained, to allow you to support lights, fans, vents and all the associated gadgetry that comes with growing. Closets usually require drills...
And of course, faster to make disappear at short notice, leaving no evidence. (I'm presuming that's not what you meant when you said about moving)
I see buying a tent as the 'the next step' in the natural evolution of the grower. It's the step from hiding it away, sneakily, in a cupboard to the more scientific, and usually more professional, controlled 'perfect' grow.
Whatever you do, enjoy
PR