I have zero experience with that Arion pedal, but here's a few options to consider for chorus and flanging that I've tried:
EBS Unichorus - warm chorus on one setting, mild but effective flanging on the next, and pitch modulation (akin to a chorus/vibrato pedal on high settings) on the last one. Minimal noise, compact, and simple to use. Only one mode at a time. Analog. Stereo outputs.
EHX Stereo Electric Mistress - full-fledged metallic, colorful flanging that's parallel to its warm chorus section. Chorus and flanger signals can be blended together, or you can just use one or the other. LED changes colors to reflect the rate. Common rate is shared for both. Built-in frozen flanger mode ("Filter Matrix"). Digital and virtually noise-free. Stereo outputs. Cheaper than the Unichorus (about $118.50 + tax).
I figured, if you don't feel like taking a chance on a discontinued pedal, there's always a few inexpensive options you might like more.
