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Without knowing what you do, it's not easy to make a suggestion. If you're a handyman that needs a backup tool, the heavy duty Surge is good. If you carry a separate high quality folder, then get the Wave because you don't need Charge's premium blade. If this is the only tool you carry, then the Charge makes sense.
That's good advice. In pondering among them, however, consider that while the Surge is the most versatile because of the extra heft, blade exchanger feature, and an awl, which the Charge and Wave lacks, it is also heavy enough to make a difference for EDC, although of no consequence if it will be carried in a bag or glove box.
It may not seem that the extra @ 3.5 oz compared to a Charge would count for much, but after a few hours on your belt or clipped to a pocket, it will definitely make itself felt. Although aware that the extra ounces don't matter to many others, I am not one of them. In my experience, it was kind of subtle. My conscious mind thought it made no difference, but I found myself reaching for the Charge much more often than the Surge and finally had to admit to myself that for me, the Surge was just over the line too darn heavy (also sharp-edged, but that was fixable with a bit of sandpaper). OTOH, the Charge rides with me all day, hardly noticed until needed, and has been up to all demands, so far.
But as they say, YMMV (how do you pronounce that?)
Thank you everyone, I'm going with the Charge Tti, I'm new to knives and I'm starting to collect them. What would be a good addition to my collection? I have a Kershaw, Swiss Army Evogrip 18, Leatherman Micra, Leatherman Charge Tti soon, 3 other swiss army knives and 3 cheap bad ones