I cant offer advice on which strains smell the least, sorry, but with regards to your carbon filter query, if stealth growing is what you are doing then you can not be too stealthy.
Only a few weeks ago there was a massive bust in my home town due to an off duty copper walking past a house and getting a whiff of gange and then returning to the same address in an official capacity, admittedly your single plant wont smell like the thousands the Vietnamese guys were growing in a 3 story house but the lesson is clear, nothing smells like cannabis and its a smell many people recognise instantly.
I operate on a system of total paranoia, I have many friends that toke, many come to my house and smoke my grass but none of them know I grow it, they all think I buy it, they never realise when they use my loo they are actually right opposite a room full of growing ganga. I use a carbon filter and ONA gel and my house is odourless, even when I have had cheese strains drying there has been no smell escaping the grow room.
If you want to avoid a visit from the boys in blue do everything you can to hide all evidence of your activity.
Happy growing.
Outstanding advice!