You mean the ones where they essentially wiped out and replaced the locals, like the US, Canada or Australia? Or the ones where the locals are majority, like India, Bangladeh, Pakistan...

Not sure that the comparison is all that favorable with France. You check Algeria and Egypt, or Uganda and Niger, and it's not exactly a massive spread. The most positive comparison would be with Italian and Belgian colonialism, which managed to be incompetent and (even by colonial standards) gruesome, respectively.

Adding my two cents, major curses to humanity today..

• Britain always followed the divide and rule on it's colonies and it still curses them and beyond.
• Most of the border disputes today can be lead back to british decisions.

There are million more reasons, but it's just not worth arguing with UK now.

I think you should read up on which countries are former British colonies, because there are definitely a lot of them not doing so well either.