Taurus is often cited for its "spotty" customer service.
That said, the 24/7 line of pistols is a very well made line, that few people report having issues with.
The SW99 is the classic Walther P99, with slightly more american garb on it.
Both are good guns.
Decide if you want a DA/SA with a decocker or a manual thumb safety.
I would go with the SW99 for style, as I do find it a very attractive firearm.
I would feel confident with either one on my hip.