If you BYOC first, without knowing the other delay pedals, then you will always wonder if you have the right one.
There is
an Echo Park Line6 module. Sounds ok, versatile, but reliability has come into question a lot with their
Tone Core modules. I sold mine.
I had
a Guyatone MD3 that I now regret selling, and it will cost me an arm to replace it. Very nice sound, very versatile.
The Ibanez DE7 is a decent compromise with price and sound, but the AD9 is a better built pedal and costs more.
The Boss delays are nice if modded, as with any Boss pedal. If you can do your own mod, and you want it to last, even if it may not have the best sound and the highest price tag, then Boss is a good alternative.
MXR is great sound, but some of their stuff has a higher noise floor, and you have to pay attention because they have some pedals that use a proprietary power supply adapter.......wont work on
a 1 Spot. Of all the used ebay stuff I've bought, I've had the most problems with used MXR gear. It probably gets abused more often because it's tough and more likely to be gigged and kicked around.
For me, the best stock stuff out of the box has been the Ibanez and the MXR. Allums mods are nice, but the Tone Lok pedals are extremely annoying to work on. Boss is easy to mod, MXR mods are usually best left to the pros. They may be deliberately making stuff now to be "mod resistant."