Does exterior paint really work better on inside walls?

In reality exterior paint is just has more solids in it than interior paint. Actually it can be more harmful if used internally.

Exterior paints are designed to be applied exterior surfaces with the intent to withstand sun, wind, water and mildew. This is done by increasing the amount of resin and pigment in the paint as well as using more resilient additives. Exterior paint is made to "chalk" as it breaks down with environmental conditions. With the added strength comes VOC, or volatile organic compounds, which outgas from paint and can be harmful to breathe for some people. Children would be more suseptible.

Interior paints are designed to withstand abrasion and to be low or zero VOC. Interior paints are designed to be more delicate than exterior paints because the occupy the same space as we do. By todays standards a Low VOC paint is has the same VOC levels as a Zero VOC paint from just 10 years ago. And the zero VOC paints of today, which still have minuet levels of VOCs, are the most gentle to date. Low VOC paints have far superior abrasion resistance than zero VOC paints, so while its gentler on the air you have to be gentler on it. Which brings me to my next point, interior paints are designed to be scrubbed. The level of scrubbing is directly related to the level of gloss in the paint. Flat paints have the least ability to wash but are easiest to touch up. While high gloss has the best ability to wash but are the hardest to apply. In ‘dry’ areas of the home such as living and bedrooms a low sheen paint is a nice in between. And in ‘wet’ areas such as the kitchen and bathrooms a semi-gloss is ideal. Now a low sheen paint can be used in bathrooms and kitchens to maintain consistency throughout the home.

http://llhomeimprovements.blogspot.com/2012/06/can-i-use-exterior-paint-inside-my.html?m=1

I've never used on wall's but I have used it on the wood. It will last a lifetime. 11 years ago I used white exterior on a rocking chair. It's still like new.

I agree with William, exterior paints contain chemicals that you don't really want to be exposed to indoors. It's tempting to use indoors because of its durability, but I stick to indoor paint.

https://www.quora.com/Can-exterior-paint-be-used-to-paint-an-interior-room