I want to buy one of them,but which would be better for me?I can only buy either the Endgame or Analytical Manual.My rating is 1598 in chess.com
Analytical Manual is too advanced for your level 2100-2300 rated players consider it a very,very tough read I see you opening that book being awed by how hard it is and then putting it away.
On the Endgame Paul Keres book Practical Chess-Endings is more like it
Or How to Play Endings by Zonsko Borovsky
He emphasises understanding of the principles of the endgames not memorizing moves when you master what he teaches you can apply his techniques to any situation that may arise in your own games for the rest of your life best $6.75 you'll ever spend no need to buy any large tomes.
It's in descriptive notation by the way.
Good luck!
Then you should work on endings if thats your biggest problem . Improving in chess is about working on the weakest area of your game the most . It doesnt mean you shouldnt work at all on the other areas as well however .
my point