I think it's important to note that if you are targeting a game for mobile, ARM based processors have a much more difficult time processing floating point numbers then integers.
It is not terribly important. This is only going to cause an issue with massive number crunching. Still, it's fascinating to know the differences and how processors handle numbers.
You might want to know the difference for other things though. For instance, floating point numbers can technically be less accurate then integer based numbers. This is a big deal for heavy accounting software. It's better to convert any moneys to pennies (for American money), do the maths, and convert it back to dollars and change.
With all that said though, for the scope of Construct, and as Ashley has said, it doesn't matter really.