I have a Surly LHT equipped as a trekking bike. It came with hex socket bolts. My rack came with Torx button cap bolts. I want a single standard type of fasteners.

I could get a couple of hex and replace the Torx. Or buy a bunch of Torx and replace the hex. And while at it, I could purchase the "security" variant of either type.

My inclination at this point would be to go with standard hex socket bolts all the way (I assume that a socket screw is easier to remove if stripped; that a hex bit is easier to find if you have lost your tools away from home, etc.). On the other hand, Torx is said to be less likely to strip and requiring less material to achieve the same strength as an hex, hence the button cap design. I also happen to have excellent security Torx bits, so...

What would you do?

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Update -- I went for regular socket cap hex all-the-way
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For what it is worth -- I ended up replacing the few Torx bolts supplied with the racks with socket cap hex fasteners. Paradoxically, I had made up my mind in favour of replacing hex fasteners with Torx, because the latter is supposedly superior. It is while taking stock of the screw inventory that I changed my mind. The main reason being that while Torx is theoretically a better interface (more positive grip, less likely to strip), it assumes that the driver is properly positioned and that (significant) downward pressure keeps the bit firmly in place. It became obvious that in practice Torx would be finicky in harder to reach locations (e.g. rear dropouts). For instance, it is not possible to use a Torx bit to hold a screw horizontally, something that is easy with hex sockets.

Even though button (rounded) caps might give a better appearance, a socket cap provides much more material to work with if the head were to become stripped (either the Dremel trick, or the ViseGrip trick).

I saw no compelling reason to bother with security variants of either type because it would have meant having to always carry a-typical bits. Murphy being who he is, someday, someplace a screw would have become loose, without it's exotic bit in my tool bag, because it's been lost in the dust, on in a puddle, somewhere far from the convenient-exotic-bit-store

I’ve also taken this opportunity to replace a few M5 that were using the smaller 3mm drive.