As a big fan of both Victorinox and Leatherman, I have several samples of each. For their different capabilities, and some cases emotional attachments, I love them all. If, however, I had to choose "one only," I would cry like a little kid at losing my Swisschamp, Trekker, Juice S2 and the rest, but there is no question in my mind which is the keeper in the bunch. Without hesitation, I would hang on to my Charge Tti with its accessories, including an awl mod. It's the most compact kit I know of that can tackle any chore a multi-tool can handle, has one hand opening (a HUGE convenience), and is the only one equipped with a premium blade.
Tolerance is individual, but I find the package including bit kit, extender and flashlight fit neatly in the standard nylon pouch and is easily belt carried all day. For casual EDC, the Tti goes solo into my RF jeans pocket by its excellent deep carry pocket clip. Snug in a high, tight jeans pocket, its bulk is hardly noticeable (although when fishing in your pocket for keys, you will notice it plenty), but other kinds of pocket might not be as hospitable.
Take some time with it, learn its capabilities and quirks (squeeze the handle too high up and it will pinch your palm a blood blister worth

) and enjoy

.