There are so many vaporizers out there and so many differences in technical approach and characteristics. Quite frankly, aside from dense clouds, to be really helpful we would probably want to know what else you value in a vape.
With that said, and assuming that you meant a desktop unit for home use (vice a portable for home use), then I'm going to go out on a limb and suggest a log vape like the Enano. I also own a Volcano and an EVO, but heavy hitters so why the recommendation for Enano.
Well, its reasonably priced compared to others, its simplicity at its best, its convection, its very efficient and runs well with .05 -.075 gram loads (impressive), will provide very good taste, and depending on the temp you pick, it will give you clouds for certain. Also, you can use direct or with an Enano GonG and water pipe. It does use glass and glass breaks.
Now, if you don't care about cost and what to run larger loads, perhaps the EVO. I have the EVO with a Turbine Hydrotube and it is THE BEAST in terms of cloud generation and its a pretty efficient convection vape also. I run my EVO at .1 - .15 grams but it can easily go to .3 or higher if you like larger loads. Also convection and clean all glass vapor path. It also uses glass and glass breaks.
Now, the Volcano....its built like a T-72 tank, requires almost no dexterity (for medical patients), is completely and 100% consistent with reproducible results, is flexible on load size (between fully filling the regular chamber, only putting .15 grams in a regular chamber, or using the dosing capsules and reduced chamber for .05 gram loads), and bag vapes are very nice for sipping while cooking dinner and the like and are wonderful for parties or group sessions. No glass.
There are SO many other good vapes and perhaps with more info I or more experienced members can give you better guidance.
Cheers