i would tend to agree with takticool. last time i raided a liquor store, the saiga 12 was great. but when the mob that owned the store came to my house at night.....wait....it was still great. because i had a ten round mag and never had to reload.
if you were in a situation where you needed to change the kind of round you were using, a tube would be great. that isnt the case with HD. you will most likely fire one, maybe two shots, and never have to reload, no matter what you are shooting (8 round tube or 20 round drum).
that said, the saiga is probably equal to any tube loader in HD.
but there are two other things to consider: number one, the saiga is epic cool if you like the ak platform....or even if you dont. it gets style points your benelli, or your remington, or whatever, would not. and the range would be more fun with 20 round drum mags
. number two, if you ever do have to defend your house, and you get charged with murder (happens unfortunately more often than you would think) the jury will be more forgiving if what they see has a wood stock and doesnt look as gnarly and beastly and war-y as the saiga.