That's a tough comparative to do. Both are quite capable in the terms of creating great clouds of vapor, awesome flavor, and great throat hit.
The provari has a lot of protections built in. These protections can make it challenging for a beginner to use a genesis atty on. To make this little beauty shine you have to have knowledge of ohms law. It has a current limit of 2.5amps and a voltage ceiling of 6 volts. Running it hard at the ragged edge WILL give you a thermal protection error. It will also give you a lo resistance error if you try to use a coil under 1 ohm.
The iHybrid is a mechanical mod with only one built in protection. It has a vented switch which allows for the pressure released from a runaway battery to escape. As long as you clean all the contact points, switch, and threads it is a pretty dependable device. Add a kick and you have the ability to set your wattage and it will regulate the resistance of the coil accordingly to maintain a constant wattage regardless of voltage. The kick also has a cut off effect at 3 volts to keep from over discharging your batteries.
Any way you look at em genesis attys can be tuned to the users taste. Each user is different and so are tuning and effects of any genesis atty.
From a cost standpoint setting up a kit with either mod is pretty even. For ease of use I would give the iHybrid an advantage. For built in safeties the provari has the edge. ( add a kick to the iHybrid and it is on par in my honest opinion )
My best advice would be to study up on genesis devices, how to set them up properly, battery safety, and materials needed to maintain them. Obtaining a good understanding of how they work and the safety factors involved is paramount.
I really can't give you an explanation of vapor/ throat hit / flavor differences between the two set ups because different coil, wick, voltage/wattage gives different results.