Subjective really.
I am one of those mythical drug users who doesn't smoke Cannabis with any frequency, I have never found the effects to my particular taste or enjoyable enough to warrant the cost, the smell, or the millennium (or there abouts) of easily detectable metabolites.
For me, 5F-AKB48 is much better. The high is far more cerebral, more interesting, less physically sedating, of a shorter duration, less obvious peripheral effects, doesn't smell like Satan's asscrack and if you have 12 IQ points or more and blend it yourself the cost is mere pennies.
Some SCRA's are horrendous subjectively, some are objective poisons, some are highly enjoyable, some are barely worth mentioning - comparing them all to Cannabis is like saying all stimulants are pointless apart from Crack.
Though if approached from an uninformed perspective they will absolutely fuck your existence if given half the chance. Cannabis is the unique exception in its class, rather than everything else in the class being homogenous.
Yes, Rizla papers can be swallowed and (partially) digested. They are very often used to wrap up an amount of powder to be swallowed at the current or a later point: "parachuting" and "bombing" are often used to refer to the practice.
Place powder in the central fold and pull all the edges upwards, wrap around the powder until it's in a tiny compact ball, twist off the top to seal it and wash down with a drink like you would a tablet.
Be warned they do have a habit of coming open if they get wet and cover the tongue in powder and soggy paper.