Reddit or stumble-upon, which one is better for traffic?

[warrantyau]

Reddit or stumble-upon, which one is better for traffic?

[Paro]

Reddit Is the best way to get the traffic..

[jayam]

Driving Traffic By the end of 2014, StumbleUpon drove 0.50% of all traffic coming from social sources; a bit behind Twitter but way ahead of Reddit, the Internet's front page. ... When a piece of content goes viral on StumbleUpon, businesses often benefit from a burst of additional traffic to their website.

[Dreamworth]

Stumbleupon and Reddit are both apparently getting more traffic.