I have both a strong (13) and a normal (15) 3w in my car, and select one for my bag only just before teeing off.

If my driver feels good in warm-up, I go with the 15 degree. If it feels shaky, I go with the strong 3.

It gives me a "precision driver" to go to if my driver fails. I don't use too much distance compared to the driver - especially if the driver is slicing right - but it puts me in a better position for my next shot.

I don't use the strong 3 from the fairway though, so I have to go to my 5 wood and give up a bit more distance on long par 5 holes. Again, it usually returns the favour by putting me in a better position despite being further out, and I would still prefer 110m from the fairway over 70m from the semirough.

If the course I play have 200m or longer par 3 holes, I will choose the strong over the normal 3w, just because it gives me that distance.

I find that picking the right combination of driver, strong 3, normal 3, 5w and hybrid can easily mean a few shots on the round.

And while driver lofts can indeed be as high as a strong 3, I still think the 3w is a more versatile club.

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//Mox
2008 bag:
Mizuno MX-500 460cc 10.5* Fujikura Tour Platform 26.3 stiff. (about to be replaced by MP-600 10,5* UST Proforce V2 stiff)
Mizuno F-50 3w 15* Fujikura Tour Platform 26.3 stiff.
Wilson Deep Red 5w 18* Graphalloy Fatshaft stiff
Cleveland HALO 3i hybrid 22* graphite regular
Mizuno MP-60e forged 5i-PW True Temper Dynamic gold R300 steel
Mizuno MP Black OX raw haze 50/6 GW, 54/9 SW, 58/10 LW
Heavy Putter B3-M
Titleist NXT Extreme