These are just two different kind of investment opportunities.

One should buy Hive for 100% to 1000% returns. While holding Hive, it might be better to power up, participate in the network and earn more Hive in curation rewards.

HBD on the other hand is more of a low risk investment with lower returns. There is no limit how high Hive coin can go, but HBD is pegged to $1.

Both serve two different purposes. But both being attractive investment options, it makes Hive even more interesting.