One thing I don't like about these two is that when you set them down, they tend to want to roll over onto the chain side. The 346 is a little this way.
It is a pain to remove/replace (especially replace) the B&C but the outboard clutch allows them to be much slimmer and lighter.
I have a Dolmar 5105 with a inboard clutch. It is very easy to remove/replace the B&C. But the 5105 when you add up the width of the inboard clutch and the wrap spring start assist on the starter, they are very wide especially when set close to my 545 or 550XP.