Definitely Teraflex, between the two options. Extremely good quality lifts. No sagging issues from anyone I've heard from. The Teraflex company rep is also here on the forum, to help with any questions you might have.
If you're open to other options, you can also check out the Rock Krawler 2.5 lift, as well as the Synergy (aka Poly Performance) lift kits. They are also great quality brands.
*If you are just looking to get rid of the factory rake, check out the Teraflex Leveling Kit.