Tools for designing data

This isn't a game design problem, rather a game design tool problem.

Imagine a strategy game where you need to store lots of stats such as:

name 	| hp 	| attack | defense
warrior	| 100 	| 50 	 | 50
archer 	| 50 	| 75 	 | 25

This data needs to be designed by someone. Which tools do you use?

I found two popular solutions to this: either spreadsheets (CSV and family) or SQL. Is there any other solutions? Would it make sense to use other kinds of databases like Firebase to store such data?

I'm a fan of the KISS principle so I started with spreadsheets …