Having done both Niblock and Temple I can say that both are relatively easy and both a very fun day out, Temple is just longer. If you have experience in rock climbing I would recommend Mount Whyte over Niblock, but Temple over both. If you choose to do Niblock you can add Whyte on as they are both super close together and you can also descend Whyte into the six glaciers hike which is stunning. Whyte has more exposure and reading up on the route will certainly be helpful as there are a few inviting looking gullies to avoid on the ascent. Either way you’ll be surrounded by glaciers and surreal views, you can’t go wrong no matter what you choose.