>>844256>real feature the Wave has that the ST300 doesn't isscissors, if you want to call them that - the original model had a better pair and Surge has the best Leatherman scissors 2bh
Wave also has contoured handles so it's more comfortable in your hand
Wave has a small bit driver which is handy if you wear glasses or otherwise need a small bit driver
with the Wave you also have the option of interchangeable bits and an optional bit extender (personally, i use this quite often)
the Leatherman bit kit kinda sucks, but it's good enough. if i used it more i'd just look for a higher quality bit set
wire cutters on the ST300 have a replaceable blade which is nice
overall, the ST300 is a somewhat more robust tool
the Wave is somewhat more versatile
also:
https://www.leatherman.com/compare?category=multi-tools 
