I'd go with Direwolf20 for several reasons:
1). Direwolf20 is considered a "Kitchen Sink" pack, meaning you aren't tied to one specific way to do things. Also mod customization is at a minimum to leave each mod as original as possible. Many of the custom packs have extensive mod customization to the point that recipes can be drastically different in some "expert" packs or not work as easily with others.
2). Direwolf does a "Let's Play" series on YouTube based on his latest pack when it is released and becomes available so you can watch and see how things work. Every 10th episode is available for download so you can play with his actual build (some of us have worse RNG than others
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3). Direwolf also does periodic "Spotlight" videos to show new mods and new versions of old mads, explaining how they work and how they've changed from previous versions.