As ANC said the ground up leaf is best both experience and price wise. People complain all the time about the "nasty taste" it's not so much of the taste as the texture. Though that can be mostly avoided by just putting a hefty tablespoon full in your mouth and than quickly taking a gulp of some kind of citric juice (orange juice, sunny D, Tang, ect.) and swishing it in your mouth to get rid of all the sand textured leaf out of your mouth and the taste is completely masked by the drink in my experiences. I've read the only good/worthwhile extracts are the Full Spectrum and UEI (Ultra Enhanced Indo)
I'd suggest Z-Eclectric as their kratom seems of regular potency (3-5 grams of leaf for good dose). An the one experience I had with them they threw in an extra 104 grams free for a 17.00 USD order. I read on other website that they give away "freebes" to lots of people that order from them. (Sorry if I sound like an advertiser, just trying to give you some options for your order)