I only have the Sofirn CO1 and only used it lightly thus far. I would say the choices really only you can decide on between the C01 and E01 are
E01 has more output, hence shorter battery life
one user reported 26.5 hours for the E01, but I don’t know what his criteria was. The C01 was listed at 33 hours
posted C01 output versus runtime in this post is:
Runtime with full AAA alkaline cell:
low (3200K 6 lumens / 5600K 8 lumens): 20 hours (battery voltage > 1.0 Volt)
moonlight low (<1 lumen): 13+ hours (battery voltage < 1.0 Volt )
desired output setting can be selected by switching between full or empty battery
runtime depends on temperature; lower temperature means lower runtime
If you like hi CRI, and want a light that is currently (maybe only sometimes? I have not checked lately) in production, then the C01S is likely it. I can’t fine the C01 available at a retailer, but they are available on ebay. So is the out of production E01, albeit for a few more $. I don’t have a C01S, it seems like having the option for high could be nice, but having 2 modes makes it not a cockroach light IMO.
Hope this helps