Here's why I like Bitblock, because unlike the other X15 algos, it isnt being overhyped.  Slow and steady builds a healthier network, while pump and dumps attract volatility.  Ive been poor-man-mining BBL (hitting the fountain) since it launched, and I expect it to gain value for at least the next few months assuming the devs keep up with its evolution.  So, overall, a great X15 buy and hold coin right now.