Hmmm, this would be tough for me because of my food allergies, but allergies aside, with the choices you gave I would go for the granola bar (probably because I've been craving a good cruncy granola bar and can't find one that doesn't have peanuts, soy, or wheat in it... I miss nature valley granola bars!) If I had to choose from those listed based on my allergies, I'd most likely have to get the regular chips, fritos, or skittles (only three that don't have one of the allergens in them.) I looked at the vending machines in the break room after I saw this and if I had to choose from ours, it would be the hershey's bar with almonds or the life savers everything else is a no-no for me

i would have either chose something withs peanuts or granola

Having been in a similar situation, I walked to the closest convience store and bought almonds or a banana. If they have breakfast in the morning, I always take an extra banana and yogurt and put it in the fridge, if they have one in the room. And I didn't buy at the vending machine.

But if I had to, I might go with the granola bar but I don't like most of those. Often, I just drink an extra glass of water and go to sleep early.

I was just reading the comments posted after mine and realized I didn't address the hotel side of it (I'm becoming an expert on this with travelling for work) I started being prepared for the late night munchies that invariably happen because I don't have access to things like I do at home, I usually have some protein bars and single serving packets of protein powder with me, especially when I fly so that way I have something for on the flight too (I bring enough for each day of the trip for just in case situations so I always have extra) and I bring single serving Ziploc baggies with my GF oatmeal so I can make oatmeal in the coffee maker, so I have that if I need it.
If I can I scope out my area and after I finish supper I'll run to a drug store and buy a small bottle of milk (I always have a glass of milk before bed) and if there's no fridge, I fill the ice bucket with ice to keep it cold til I'm ready. If I have a fridge in my room, I'll look for a grocery store instead of a drug store and get enough milk for however long I'm there and get some apples and/or bananas some frozen dinners (if there's a microwave,) yogurt and a pack of plasticware and paper plates. That way I don't have to eat out too often (saves money since the state reimbursement for food is not great and this way I get reimbursed for more than I spend and helps reduce the calorie, sodium, saturated fat intake of eating out), if I'm at a conference at the hotel, then I don't have to worry if they don't provide I lunch I can eat, I can go to my room and have more than a protein bar for lunch and I have good for me snacks in the room