Yes is would be a waste IMO. However, there are different sorts of stepstick available, including cheap 2 layer ones using the A4988 chip, 4 layer ones using the A4982 which can take more current before they overheat, and DRV8825 ones that can cope with even more current. Whether you need the more expensive ones depends on how much current your stepper motors need.
It's possible to run a delta on Arduino/RAMPS (just), but I recommend a 32-bit board. My preference is for the Duet because it costs less than the Smoothie and has a much better web interface. Its main limitation is that it needs an add on board if you want to drive a second extruder. If you are on a tight budget, you could consider the AZSMZ Mini, but it lacks Ethernet.
It's possible to run a delta on Arduino/RAMPS (just), but I recommend a 32-bit board. My preference is for the Duet because it costs less than the Smoothie and has a much better web interface. Its main limitation is that it needs an add on board if you want to drive a second extruder. If you are on a tight budget, you could consider the AZSMZ Mini, but it lacks Ethernet.