Actually Soul Calibur 4 is the fifth in the series (since you forgot Soul Edge the first game in the series) with one spin off being Soul Calibur Broken Destiny, making the series have a total of six games.
While Tekken has six main series and four spin offs. And Tekken came out before Soul Edge did.
So in short the Tekken series was out longer, took off pretty fast as it was one of the first big 3D fighters. Soul Edge on the other hand not many knew about, hell even with Soul Calibur on Dreamcast getting a perfect score from IGN when that meant something, it didn't take off until the second iteration being Soul Calibur 2.
Soul Calibur will probably catch up in number of titles, but Tekken was the first successful child of Namco so of course it has more games.
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