Sweet seeds are a good seed bank. I've done 2 dark devil grows and a sweet skunk grow and they were both very nice. Got a couple more dark devil going at the moment too. As for yield, like all autos you will get slightly less but its the quality of the end product. My fave is dark devil. Height wise, well....I've found that sweet seeds pheno's tend to vary quite a lot. Some medium height with good branches whilst others ridiculously short with only a couple of branches.
See the below pic of, he smallest sweet skunk plant I had earlier this year...
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