I have:
Svea 123
Snow Peak Giga Power
Olicamp
MSR Whisperlite International
Gaz Cartridge Stove
Jetboil (4 of them)
No longer have:
MSR XGK
MSR Dragonfly
Hank Roberts Stove
Other Forgettable's
For boiling water only: Jetboil or Olicamp/Pocket Rocket with XTS Pot (works like a Jetboil).
For cooking: The MSR Dragonly, Whisperlite or my 43 year old Svea 123, especially with a Bunsen burner wire mat to disperse heat.
I think the Jetboil is one of the best backpack technologies of the last 15 years.