Related to these sentences:
1- It's cheaper to send a message.
2- Sending a message is cheaper.
3- It's cheaper sending a message.
I'd choose in this order: 1-2-3 (making the third the least preferred)
All natives I've asked, all agree with me. They'd choose 1-2-3 as I did.
I consider number 3 wrong because I've always been taught that after an adjetive always follows an infinitive (to+ verb), but some americans have said they didn't find any grammatical error in this sentence, although they considered it the least preferred too.
So, my question is: Is it possible to say "adjetive + -ing verb"?
I'm happy working here. ~ I enjoy working here.
I'm happy to work here. ~ I'm quite willing to work here.
I'm exhausted cleaning up after you. Right.
I'm exhausted to clean up after you. Wrong.
In fact, you're probably lucky that you've chosen an example where the two forms mean the same.