Look for something around 25W, and ignore the equivalent power given on the packaging. Give it time to warm up before judging. You won't find a CFL equivalent to 100W which is similar size to a GLS. They are getting smaller, but haven't got that far yet.
That's a personal thing, and depends what you are using it for.
The CFL products are still moving on quite quickly. What you bought a year or more ago does not represent the best of what's available today.