I just switched to an inline this year (7x27) mainly because almost no one is making the deckover 8 1/2's anymore we went to half a dozen local trailer sales and not one had or would get me a wide trailer! I will say after my first long trip with the inline that it is growing on me I still dont like having to stagger the sleds and having deal with trying to juggle them all around if I just want to get the one in the middle out.
But that said towing wise I really like the inline it sits so much lower that it really isnt any taller than my superduty so it doesnt feel like I am pulling a big sail back there like my wide trailer did. I am also getting about three mpg better pulling this trailer over the wider one. crosswinds dont seem to effect it nearly as badly either I think mainly because of the lower center of gravity.
So those things said there are good and bad points to both trailers I would reccomend going with the all aluminum frame and trailer there is so much less upkeep than the steel frames.