paleo is much more easier than keto, but keto is 3 times as effective. both work for fat loss.
I lost almost 40lbs in just over a month when i first started keto which was like 15% of my body weight, I was only minimally active at the time so it can work on its own, but doing it with exercise intertwined again is more efficient and better for overall health obviously.
I have been doing keto and a few variations for almost a year now with steady success. I have been going heavy in the gym in recent months so I have had to mix in some carb loads a long the way but keto in between has curbed any significant fat gains for sure.
few tips:
-do your own reading, lots of myths kicking around on the subject. this is helpful
http://www.reddit.com/r/keto/
-keep well hydrated, low carb diets make you yield much less water so drink lots and often.
-keep magnesium levels up. they can be effected with an unbalanced diet so lots of greens and seeds will help with that along with others.