Well I like all reds (red Thai and Sumatra specifically) and green Malay. It took me a bit to acclimate to green Malay. Again, I would highly suggest getting smaller samples of different strains so you will know what works best for you.
I think kratom is a great herb. It has helped so many people with a myriad of conditions, ranging from pain control to addiction, depression and anxiety. The good thing about kratom is that is self regulates. There is most def a ceiling effect. In other words, less is more. Pushing the dose only results in making you sick.
To get the very best results, it prob shouldn't be taken daily. That said, I do and know others who do as well.