unless you live in year round cold weather or have a big space to grow in, i would always stick with the seal-off air-cooled type reflector. other wise your just blowing hot air around. you wanna evacuate that hot air, outside the grow area.
Thats not true whichever reflector you get An exaust fan and passive intakes is adequete to take all the hot air out, even with an aircooled hood without A/C your growroom will stay the same temprature as the outside.

Also it brings in new air from the bottom which the air cooled hood doesn't (correct me if I'm wrong).