There are points whilst levelling that it is harder to heal as a SCH than as a WHM but honestly I kinda feel that WHM is too easy. I really thought I'd be a career WHM as I loved it in XI but decided to check out SCH healing first. I'm not max level yet though so keep that in mind but so far, WHM healing is a snoozefest compared to SCH healing but I can see it will get more challenging later.

On SCH I have managed all dungeons etc so far but the level 35 ability really does help and I'm sure leeches will do even more.

I think if you want to be a career healer, having both SCH and WHM available will make you super flexible for 8 man content.

One thing I really find useful about SCH is that you can take a bit more damage and your pet takes care of you.

I think to get the most out of SCH you have to work a little harder but that's what makes it more enjoyable.