Cycles has a distinctive sound (i.e. you like it or hate it, check this thread to decide for yourself), 2 more tracks than Digitone and easily understandable and fun to play with layout. Digitone is more versatile and mature synth capable of doing both musical and percussive sounds while being limited by its 4 tracks. However with parameter locks you can create the whole drums sequence using only 1 track – check this performance by @Eaves. I would suggest you to go through Ivar’s Digitone videos on his YouTube channel to appreciate the possibilites of this synth. And I think there are some third party tools to help you write drums on Digitone.
If you’re a novice and want to “test the water” than Cycles is cheap and fun introduction into hardware synths. However in the long run Digitone will become more useful part of your setup.