Well, FI has some clear benefits, like because they are usually found on newer bikes, that pass more strict emission norms, FI bikes often go the same distance using less fuel. Or if the bikes have same tank size, FI bike goes further. Range is often important on a long trip, especially in more remote areas. Another upside on FI is it is much more clever in high altitude, there´s no messing around with jetting, etc.

Regarding fixing them on the road, I think the whole FI vs Carb thing comes down to: how much of a mechanic are YOU? Surely carbs are more simple, so easier to work on in the bush. That´s probably why some "old-school" mechanics love them (and they tell everyone, including those with zero technical expertise: go with carbs!)

In general, reliability does not seem to be the problem with FI, even on long trips and with worse quality of fuel (remember, all new cars and almost all new bigger bikes have FI these days).

That last fact also brings to mind another thing: if you want to go with a carburetor bike, it means nowadays, that your going on an older bike. And this in turn means that you´ll need to go through the bike very carefully prior to leaving, so that you make sure you wont get some other troubles related to the bike´s age.

Also good to remember, that people do RTW-trips both on carburetor and on FI bikes. Not sure, if that should be the decisive factor.

(but that´s just my 0.02, and this subject has already been discussed on these boards).