Not sure that you needed an entirely new thread for this Q but here's my take nonetheless:
If timing is of the essence to you, then seeking after the MC would properly be your best bet, even though an MC preorder is probably a while off and then you will have to add the time which it would take for fulfillment (3-6 months from when the preorder list closes, depending o the size of the list plus your place on that list!). You will also have a better chance to seek one on the secondary albeit at higher prices, since 50 or so proto MCs exist in the wild as opposed to only 6 proto HCs. The latter has sold in the 2 - 2.5 times its original price through backchannels!
Also, if you follow Lorien's posts who uses a bunch of CPK protos in his own trail clearing / trail building projects, you will note that he even quite admirably uses the lighter LC without any issues (I think that Lorien also owns a proto HC but I'm not quite sure about that). In summary if you're going to decide on a production HC, you will be probably be waiting longer than pursuing an MC. Just my two cents.