probably a different style
Danforth-type anchors are considered just right for sandy and mud bottoms, but do not set well in hard sand and soil bottoms. If there's any grass growing down there, forget the Danforth.So, you should get another kind. For starters, consider a plow-type (Delta, CQR, Spade, others) or a claw-type like the Bruce. People will argue for hours about the various qualities of the anchors I have listed here, but they are pretty similar. Some sailors carry a fisherman's anchor (also the top choice for bicep tattoos) and swear by them as they are very reliable in the widest range of bottom types. They are very heavy and very difficult to store, so most sailors pass.I always thought that the advice for setting two anchors was affected by this practice, since 99% of the boats with two anchors have two different types. That means when you set out both anchors at least one of them is the wrong kind

However, if you sail in an area with very uniform bottom conditions (the Chesapeake comes to mind...) you might just go with two anchors of the same type, if you often set out two anchors for additional peace of mind or to reduce swing.