Currently I use the DC-2 sim in my GT1000 Core, sound the same.
What is this? I haven't found a DC-2 sim in the Core?
I do like the Core CE-1 model, with the preamp colouring. Of the pedals, I've got a CEB-3, a CE-5 and two CH-1s, all of them analog (yes, I was deliberately searching for them, to make comparisons). Haven't tried the digital versions. Years ago, I had a CE-2 and an original DC-2. Would like to try the CE-2B one day.
Between the three pedals, there are differencies. There are differencies even between the two analogue CH-1 pedals. But, I haven't found a best, or a clear favourite, among them. Maybe one of the CH-1s, I don't know.
I have a/b'd them, a lot. At home, with headphones, at band rehearsals, at gigs. And got frustrated. They are all good, but everything depends on the context. With different music styles, different basses, not to mention other pedals, one of them usually shines brighter than the others. But not consistently.
The CEB-3 has stayed on a pedalboard for the longest time, first with my sludge/doom band (where it got eventually replaced by an Ibanez BC-5 Bass Chorus. A cheap plastic Soundtank with a big sound). The CEB-3 now stays on my postpunk/goth/hc -board, I like how it preserves or even boosts the low frequencies, in a style where the bass can easily get a bit too clanky and overly bright. It sounds excellent on fretless.
The CH-1 seems to be a more multi-purpose pedal. One of them is on another board I've building for some darker, more atmospheric playing on a Bass VI. Also good with fretless.
The CE-5 has not found its place yet. I've been trying to fit it in, but no luck yet. It seems to have a bit thinner character than the others, unless the low control is maxed out, but it sounds nice on guitar.
Ah, and there are some very slight but audible (to me) variations in the waveforms: the CEB varies somewhere between a sine and a saw, one of the CH-1s sounds a bit more like a sine flirting with a square, and so on. All said, it feels to me that they are more or less variations of the same pedal. A good pedal, I must say: I had a Walrus Julia, a Diamond Chorus, an EHX Bass Clone and other well-established chorus pedals, all gone. I do have some Ibanezes though: the BC-5, a CS-5 Super Chorus, a Mini Chorus. Very different from Boss, cheap and nice!
I voted for CH-1 (Actually, changed my vote from CEB-3).