Both.
Jamstix for composing the drumtrack (forget about Jamstix' samples). It so much easier using Jamstix than having to listen to loads of midi drum loops.
Toontrack for the sounds. (I use Superior, but the answer is probably valid for EZDrummer too).
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Reaper 5, latest release, 64-bit w SWS |GA Z270 UD5|Intel i7 K7700|32 GB RAM|Fireface 800|500GB SSD sys, 1TB SSD Rec, 4TB HDD samples|Win 10 64bit|Dynaudio BM6A|Softube Console 1|Sonnox|Waves|Melda|Superior 3|Komplete 12U|Melodyne|Slate|Izotope.
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