The folks at MBR UK have created a super comprehensive guide to help buyers choose a Kona. Hardtail? XC bike? Trail? Gravity? There are a lot to choose from and picking the one bike you need can be overwhelming. Their advice is to think about the kind of riding you do and pick a bike that best suits the majority of your riding. If you live in a fairly flat area but go to the bike park once a year, it’s probably wise to buy something that is good at pedaling. Fortunately, there are a lot of Konas that can be ridden in a wide variety of terrain.
Check out the MBR UK article to get a good idea of what bikes you should consider.