I turn a ton of acrylic (duck calls).
The answer to your question is NEITHER.
The Easy Wood tools will work on acrylic, but you'll find that they're too agressive and even with the best tool presentation it will be nearly impossible to avoid the tool digging in occasionally, which will result in little chipped out areas. I have them and love them, but I save them for wood.
A conventional scraper will do about the same thing, just not as efficiently, and with the same results.
What does work is to turn your conventional round nose scraper into a negative rake scraper. Grind a small 15 degree bevel on the top of the scraper, then grind the bevel of the scraper as you normally would. That'll make it much less aggressive and you can really lean on it without damaging the acrylic. You do have to sharpen it a lot, as the burr is much less prominent.
What works even better is spindle gouges. I rarely (if ever) use my scrapers on acrylic anymore. I turn the majority of my acrylic calls' areas with a roughing gouge believe it or not. Detailed areas are turned with a detail gouge and flat areas are turned with a parting tool.
My suggestion is to use properly sharpened (and properly presented/utilized) spindle gouges for acrylic work.
Here's one of my acrylic duck calls...