Cenarion ward is probably better against bursty teams
If CW is a 30s cd, then Ysera's would heal you for 60k during the 30s that CW is on cd. 30 seconds / 5 seconds per tick * 10k per tick = 60k. I think CW was ticking for 40k every 2 seconds? Does any1 know the actual value? If I'm remembering correctly, CW ticking for 40k 3 times over 6 seconds = 120k. That's 120k/36s = 3.33 hps vs 60k/30s = 2 hps...unless I'm not remembering the CW tick value. That means CW would be better against any team, even rot teams if you use it on cd.
Edit: I'm not taking into account the new gear though, which will increase our overall hp.