I could see how you'd make that comparison, but personally I'd argue that the synthetic cannabis shit was far more dangerous. At least with 7-OH, you know what chemical compound you're getting. With Spice it was a complete crapshoot cause the manufacturers would keep rearranging the chemistry in order to get around the DEA ban. Every time you went to the headshop to pick up a tin of that nasty-ass potpourri shit, you never knew what you were getting. At least the 7-OH pills list their ingredients; you didn't get that at all with Spice, beyond a generic "not for human consumption" warning.
But regardless I still would suggest staying far away from the stuff, especially if you have poor impulse control.