I don't think you had a combo option.
I mostly buy it on long trips- I mean,4 weeks or longer. I don't buy it for Canada, US, or Mexico (haven't been south of Mexico).
For a few reasons:
My main reason to buy it is health insurance- I'm not covered internationally and I'm a bit of klutz. I have yet to hurt myself seriously on vacation (knock on wood) but there have been a few times when I was younger that I certainly should have gone to the doctor and didn't.
With longer trips, it's also a much bigger inconvenience if my luggage or phone were to go missing. That's an immediate replacement situation. It isn't as if I'm 6 days into a 7 day trip. And it's way more likely to happen on a longer trip, too, as is trip interruption. (I haven't done a long trip to Canada or Mexico.)
But you have to look at what the policy covers to decide if it's worth it. For instance, say you break an ankle- unless the doctor signs off on you going home immediately, you can't just decide to buy a plane ticket, cut your trip short, and get reimbursed for that. Many policies will fly you home only if the doc says it's a medical necessity- but if your trip is mountain climbing, you can't really continue with a broken leg. So you'll be paying for that flight home out of your own pocket, or you'll be finding something else to do. So, the last place I purchased it through was
AAA, and I just bought medical coverage, because the pricier plans didn't cover anything that I was likely to need. If I lose my luggage, I don't really think I'm going to find many options for clothing that fits me in Japan. If my flight is delayed, either the airline will put me up in hotel or I will pay for a $20 hostel bed that is 1/15 of the cost of the actual policy. I give myself plenty of wiggle room between flights and I don't do cruises or tours, so when I get there is when I get there. I'm not renting a car. My rental insurance would cover my camera and iPad, but neither were all that expensive. I rarely book lodging that would be nonrefundable. If someone has an accident while I'm there, I probably won't be flying home to help, as there are people who could pitch in on the spot. Anything other than medical coverage would be overkill. I don't know if it covers repatriation, but I'll let my family worry about that- I won't be around to do so.
So: basically, what coverage you should get depends on what kind of trip you have booked, you or your traveling companions' current health, family member's health at home, your current insurance policy coverage, and what your luggage is actually worth.