I use a Source Audio Lunar, it's got some sweet features that are really helpful for bassists.
What I find missing on most analogue Chorus / modulation pedals is the lack of a bass friendly wet / dry mixer or a comprehensive EQ to dial back your original bass tone. Most modulation pedals are designed for guitar and have a pretty hefty bass cut. Bass doesn't output a lot of top end (which is what triggers the chrous effect), so we tend to need really heavy / full on wet sounds to barely hear any chorus effect in our tone. The sort of chorus levels that would make a guitarist shudder.
Most mixers are a 50:50 wet dry control, which is fine for guitarists who neeed that level of subtelty and won't miss the inherant bass cut that this type of mixer will bring. For us a bassists, the more we blend in the wet, the more chorus but loss of bass...blend in the dry and you loose a massive amount of chorus but gain a bit of bass....it's not helpful. A low retain blend is far more helpful, ie one that blend the mids to upper frequencies but leaves your bettom end alone.
Unfortunatly, this isn't very common on analogue Chorus pedals and is often missing on some large multi-modulation panels too.
Fresh bass strings help create the necessary zing to push the treble frequencies that are needed in a chorus effect. Good luck with flats....
The SA lunar has a really comprehensive 4 band EQ under the hood. I like to dial in extra bass than rely on the messy blend controls. I also like to assign a treble control to around the 4K region. This is really nice for boosting the necessary frequencies for the Chorus effect to be heard in a mix. The Lunar is easy to power, gives me 6 patches (that can be any type of modulation) and it's in a small box that's about the same size as an analogue chorus but with a ton of digital functionality. It also sound fantastic and doesn't sound digital at all...in fact more people thing it sounds very analogue and vintage.
As I said before, don't be timid here...maxxed out chorus effect is usually "is that all...I could do woth a bit more?" on bass.
Generally a tri or quad chorus is needed to really make the right sounds on roundwound bass strings that are a few years old.
I have Lunar patches available on the Source Audio Neuro cloud, look them up under "Gazzajagman".