the R300 is indeed a 3-way, but it adds a woofer, not a sub-woofer.
I'd add a sub to the R300 in any case as well.
The advantage of the 3-way is it can play mid-bass frequencies (80 - 500Hz) much louder and go a bit deeper (maybe 50Hz) than the smaller 2-way.
So it will have much more 'punch'...