The main complaint for TGW is the scriptedness, which Endsieg has too but in a less degree. Both do some things better.

Hopefully they fix it so I can do an up to date comparison, but at the moment Endsieg has absolutely no competition. The Great War mod has a problem with the AI researching MTG or other types of ship hulls even though they're not in the tech tree, which means 16 year ahead of time penalties and their extra research slots going towards ONLY doctrines. Endsieg's 1910 start date is just a tad bit less interesting, and has fewer tech tree and focus tree options, but at least your enemies actually field new equipment here. I do miss a lot of the setup for TGW's research, though. And Zeppelins. . And more armored cars, siege artillery, etc. Endsieg takes the cake at the moment though. (Don't forget to try the ww2 scenarios, of course!)