I've thought about this many a time...
Pros:
makes grief less complex for loved ones.
more "honorable" memory. especially for religious types.
possible insurance
cons:
less control over method.
less likely to be peaceful.
higher chance of failure and permanent damage or vegetative state.
An overdose might look "accidental" but its probably only a tier above suicide in terms of the pros and cons i listed. The person was obviously suffering in life. it also can be hard to OD. I've know fentanyl is pretty strong but I cant get it here. And then i'd have to first take on the identity of an addict, slowly transitioning to be known as an addict before i eventually OD. This would be just as painful for loved ones to watch the demise to addiction... unless your already battling addiction. but for me it would be an obvious one off use for suicide. not that i am above addiction, if i had access to anything to bring peace I would use it.
Another contender for me was a car accident... I'd have to remove the air bag to up my chances. A lifetime of pain from surviving would be torture. So instead I'd use a motorbike but theres still that chance of survival. Plus, riding fast in to a wall or tree would be terrifying for me when it came to it. A lot of gore too. im too anxious and concerned with peace to follow through with it.
Then I thought about going "missing" on a boat out at sea while taking something with me to die peacefully and hopefully just drift off in to the ocean never to be found. but this would require me to learn some basic boating, and i may just drift back to shore dead with obvious suicide. or waste resources with a search party or worry others that I suffered being stranded at sea or drowned.
I've tried to think of it all, going missing after "travelling" overseas - too much public attention and worry to others.
snake bite on hike - too slow and would be hard to find a wild snake and time everything.
smoking drinking standing in sun till i get cancer - too slow and painful.
native american/ buddhist style mindfully leaving the body and willing themself to a peaceful death... but I get the sense this takes great discipline and masterful mind body meditation practices... I'm sure if I had that much discipline over my mind and body, I could live a peaceful life with no desire to peace out..
why do u want to make it look accidental btw?