For the price, we think the best tactical multi-tool is the SOG PowerLock. Thanks to its incredibly high construction standards, 18 multi-function tool selection, and competitive pricing, the SOG multi-tool stands up well to extreme conditions and extended use.
Our SOG multi-tool review found the SOG vs. Leatherman to be the best overall value for the amount of functionality you'll get.  Of course, if you have a higher budget and need more tools, look at other Leatherman Multi-tools.