Difference between Allintitle: and Intitle:

Allintitle:

Its the basic Keyword Golden Ratio invented by Doug Cunnington.

The KGR formula is a straightforward division of the total number of Allintitle results produced by Google for a search phrase by the total number of searches for that term.

KGR is one of the simplest and most direct ways to locate easy-to-rank keyword and is a proven method

Intitle:

Intitle is almost the same as Allintitle:, but it search for broader match in google data (different keyword placement, typing error).

It's used by popular Seo pros because it's found to be more accurate than Allintitle: in certain very hard to rank niches.

We don't calculate a Ratio with Intitle, we determinate if a keyword is easy if "Intitle:The Keyword" in google has less 1000 results for it (0 backlinks should get you top5 quickly).

If it has between 1000 and 100 000 results, it's a medium difficulty keyword (5/10 backlinks should get you top5 quickly)

I personally prefer to use Intitle, I have seen it to be more accurate of difficulty after comparing both scores on a lot of serps by manually looking and analyzing competition