Of the 2017 Spark and 2017 Genius, I’d have to give the climbing award to the Genius.
The Spark at 120mm is equally, if not more, capable than the genius’ 150mm at descending. but in terms of up, the steeper genius really does a superb job on the steep and tech climbs!
I love my 2017 spark, but loved my previous Genius for very different reasons!
The 2017 Spark 740 with the 34 up front and the seemingly bottomless 120mm from the Fox Nude out back will be an great all day bike that you will be able to eat up laps of the trail centers as well as having a decently competetive sport class race bike.
28lbs on the Spark is 3lbs better than the Whyte
Worth thinking about the 940 also?!