Honestly there isn't a dimes worth of differance between the two in most cases. At least you won't find any animal that will be able to tell you the differance.
Having said that my personal preferance is the .280 over the 7mm mag but I am biased against belted magnums.
In a handi rifle the 26" barrel of the .280 will still be only make the entire gun 42 inches long which equals the length of any bolt gun with a 22" tube. Still very compact and easy to maneuver through the woods.
With the 26" barrel you should be able to pretty much equal a 7mm mag with a 24" barrel.
As far as the .270 being an inaccurate cartridge..... Not so. Every gun will be different. Sometimes you gat a bad one but most of the time you get a good one.