MDMA is just objectively more toxic than cannabis. this isn't really subject to your opinion.
if what you're referring to is the fact that cannabis is frequently smoked, that's not a fair comparison. oral cannnabis products exist too.
No matter how you spin this one, you have to be careful with whatever road you choose to go down.
are you really going to start talking about "easily overdosed" when the drugs you're comparing it to are lsd (active in the microgram range) and mdma (active in the milligram range)?
seriously, you feel like you can get away with claiming that cannabis is more dangerous than a drug that most people encounter as mystery pills at a party? get real.
in legal states you can buy properly labeled edibles at a shop. if it's homemade stuff, you really have to be a lot more careful. either make it yourself or really trust your supplier. personally I would never take edibles bought from a dealer unlabeled. that's a real risk of an uncomfortable experience.
I think smoking (or vaping if you're sensitive to the smoke) is by far the safest and most effective way to take cannabis though.
LSD and MDMA there are really no safety tips that can possibly help. you either trust your source or you don't. if you trust your source and follow the dosage guidelines it's fine. both of those drugs are very safe at appropriate doses.
You CANNOT overdose on cannabis. As in it will not kill you.
The only way you could say that is if you have some weird definition where by having a "bad trip" counts as an overdose.
For the record I've never had a bad experience with any of them. I'd say cannabis and MDMA are my favorite substances, though I mix them with tobacco and alcohol so I suspect there's a synergistic effect where my reward center is being lit up like a Christmas tree. FWIW I don't go out to raves or clubs - I'm old and an introvert - I just hang out with friends in our own homes or outdoors near our homes so the risks are lower.
it's incredibly non-toxic, cheap, easy to get, actually legal in some places, easy to confirm that what you bought is what you think it is, and will produce a pleasant and mild high that has some attributes in common with psychedelics (though it isn't a true psychedelic in the classical sense).