Never, Ever compare PHT to PHK. The only way they are similar is they both happen to start with PH.
In fact I think Pioneer should somehow change the symbol if possible just to break the association with PHK by the uninformed.
There's a reason PHT has a premium, superior holdings. PHK has Gross for "star power" and I'd rather PHT. When Gross drops dead (he's 68) about three bucks goes away from that fund, which returns principal and makes you think that's a winner.