I can't decide vs I cannot decide

Some examples from the web:

• I can't decide which one of your hates I like better.
• I can't decide which looks less appealing.
• I can't decide which theory I endorse at the moment.
• I can't decide whether you should live or die
• But I can't decide so suddenly.
• I don't know - I can't decide now what to make of you.
• I can't decide which one to wear to the show tomorrow...
• And I can't decide between French fries or onion rings.
• I can't decide which of you to kill first.
• I can't decide which one Aunt Laurie would like.
• Becky, I can't decide.
• Thomas, I can't decide which hat to wear to the wedding.
• I can't decide which encounter was the more unpleasant.
• I can't decide what I want.
• I can't decide which guests are the most important.
• I can't decide whether to call him Henry or Edward.
• I can't decide which car to buy.
• I can't decide what to do
• I can't decide which of us has the worse gig here - you or me.
• Well, I won this cruise to Mexico, and I can't decide whether to take Peter or Judy.

Some examples from the web:

• I cannot decide to get married during Tech...
• That being the case, I cannot decide for myself.
• I cannot decide whether that makes you trustworthy...
• Man. I cannot decide what I want.
• And I cannot decide.
• I cannot decide that these are regulations that we do not like, so we will do it our own way.
• I can help, I can support, I can illuminate you but I cannot decide for you.
• What is the right to vote if I cannot decide?
• I cannot decide about this neckline.
• I thought all month and I cannot decide.
• I cannot decide between the muffin or the fruit salad.
• I cannot decide alone to withdraw this request.
• I cannot decide between LED or XHL iIlumination.
• I cannot decide whether to go or not.
• All I want is a cheeseburger, fries, and maybe a milkshake, even though I cannot decide about which drink yet.
• T minus 60 minutes to go over your math homework and your spelling words... I cannot decide which one I want to do first... and I will have you at school with plenty of time to spare.
• I cannot decide that.
• DEAD MOUNTAINEER'S HOTEL Many years have passed since that time, hovewer quite often, during the dull duties or sleepless nights, I recall what happened, and even now I cannot decide, whether was I right at that time or not.
• I cannot decide what is the best thing to do.