The thing I like about Sierras is that if you work up a good load with a particular bullet, there is a good chance they will still be offering that bullet the next time you need to buy some. Not so, many of their competitors, to wit:

Nosler: solid base, many iterations of ballistic tips,
Speer: hot cores, Mag Tips, deep shocks, deep curls, now hot cores again, redesign of the Grand Slams...
Hornady: dropping many interlocks, AMax?
Barnes: how many iterations have we seen of the x bullet?

The latest and greatest can be good, but it is a two edged sword.