SbestCFII
Line Up and Wait
Or PLB like a SPOT. Plus it provides enhanced SAR with LockMart/FSS, they'll send out SAR immediately if you stop moving.
Downside of PLB/SPOT is their location in the aircraft. Unless safely stored in a better protected area of the airplane, then they can more easily be damaged or destroyed on impact than most ELTs. Plus most PLBs are activated by the user. If you were going down, you could deploy the device before impact I suppose and hope it doesn't get damaged, but in a case like this cumulo-granite happens suddenly.
We should all have 406 ELTs in our planes. You can get an ARTEX for just over half the cost of a PLB, about the cost of an IPAD, and far less than the cost of our IPAD associated accessories (ILevil, GDL39, Stratus, etc.). I can tell you from CAP that flying grids looking for 121.5 ELT signals is far less efficient and more likely to result in a recovery than a rescue.