Pending detailed suggestions from the wise and giving souls who populate this forum, you really should spend a few hours just reading through old threads in this forum. Even the wisest and most helpful don't know your mind, budget, and travel goals so you'll be far ahead mining posts for data that applies best to your needs.

I'd not ever use an xONEx and fly only 14 segments, but I suspect there are those here who (or whose companies) buy them and use the minimum allowed.

I'd not ever buy one in the U.S. Besides cheaper prices, you can include 6 (or 8) glorious segment from anchorage down to central america, and effectively make two trips out of it.

I'd not likely ever buy 5 continents.

There is no path between Africa and North America that won't cost you Europe.