When I was playing in electric bands, up to about 2004, I always used sets with a wound 3rd on my Strat, and prior to that my Gretsch and my Tele. I was playing mostly chords and, for that purpose, a wound 3rd plays in tune better than a plain string. There are electric sets available with a wound 3rd - e.g. D'Addario 110W 10-46.

I have a set with a wound 3rd on my Strat at the moment.