Surely they're more effective than cannabis, which typically makes everything feel great, but in a sober frame of mind, and on hindsight, seem trivial and over-hyped when sober.
I've tried various nootropic 'blends' (stacks) over the years and they've all been great. Cannabis has its uses, like experiencing the various vibes and feel of a new city for the first time, or making a snowman when it's snowing, but it's not some panacea that makes you super-productive.
Not saying nootropics are a panacea either. You have to have the base multiplier before using nootropics, and already be in a flow state before getting any leverage from them. They don't automatically make you more productive or creative.