Which ones of these appeals more to you? I would like a different apparatus for carrying crap with the Bleriot than my Carradice Nelson Longflap. Not that the Carradice is bad; it's just a smidge too big for casual rides. It's great for a mega ride, especially in colder conditions when an extra jacket or something is needed, but I might like something a bit more demure. The price of the $56 Bar Tube is more attractive than the $95 Big Loafer, but the Loafer obviously has more carrying capacity.
I also failed to remember that I had looked at a 3rd option a week or so ago. This below is an Acorn Medium bag, made in the good 'ol USA (like the Baggins' bags too). This is a saddlebag design instead of rack one (The Bleriot has a rear Nitto rack; I don't remember which one exactly). I like the roundish, clumpish shape of this one. It seems more svelte than the Carradiced, but still allows for an extra jacket, lunch, etc. The profile pick seems to indicate a very agreeable compact shape. The Medium bag can be had for $70, but there's a bit of a wait for Acorn bags. They're hand made one at a time. If it's good, though, it must be worth the wait. More importantly to these options, such a lavish expenditure is not going to happen right now, and shouldn't. Maybe the November bday will offer a possibility.