Your choice of what could be your most dependable tactical knife to buy is really up to what you feel serves your needs. Ask other people what is the best tactical knife and you will get many answers. The truth is there are lots of good knives to choose from and it is hard to go wrong.
There are different blade steels so choose one that will fit in your environment, such as wet locations. You will see there are variations in weight so keep that in mind if you want to travel light. A knife handle that feels comfortable in your hand is a big plus; you want a good grip so your hand does not slip.
Below are a couple popular tactical knives that would be hard to go wrong with.