The difference to me is that all the Tour players go for the green on the 17th at TPC Scottsdale, unless they can't reach the green with a driver in their hand. Most get there with a three wood. Even if they hit the ball into the pond with their first there's decent chance they'll salvage par. Hardly anyone double bogey's that hole let alone makes bogey.
Conversely, there is much more risk - reward factor to the 10th at Riviera. For starters, the odds of actually keeping a ball on the green with your drive is minimal compared to the 17th at Scottsdale. This then begs the question as to where to miss in the event you're off the green with your drive. Going over the green right is the kiss of death, as it's hard to keep the ball on the green with your second as it slopes down and away from the player. Being in the trap short right is no picnic either - depending on where the pin is. Because the penalty for going long or short right is more severe than being short left is why so many players elect to layup with their drive and hope to get up and down for a birdie. If you were compare the number of bogey's made on the 10th at Riviera during this week's tour stop to bogey's made on the 17th at TPC Scottsdale it won't even be close, as Riviera will have twice as many bogey's and a lot fewer birdies and eagles.
This should tell you all you need to know as far as which hole is tougher or more demanding. As far as the the 17th at TPC Scottsdale being better is concerned; that is in the eye of the beholder. I suppose if you like seeing a lot of easy birdies with the potential drama that comes from the occasional player hitting it into the drink, then that's your hole. I, for one, prefer the 10th at Riviera, as it requires much more thought as far as the best way to play it to get down in three, while minimizing the risk of bogey or worse.