To put it in perspective, the Falcon 9 has had 702 launches and has only lost one payload during launch. A couple didn't make it into the right orbit, but there's contingencies to deal with that in manned missions.
Since 2022, there have been 601 booster landings, with two losses. (https://en.wikipedia.org/wiki/List_of_Falcon_9_first-stage_b...) That means that if you could have snuck onto one of the last 600 Falcon 9 boosters, with appropriate life support gear, your chances of survival would have been over four times higher than if you had snuck into the cargo bay for an SLS (space shuttle) launch, and that's with the SLS being designed to be manned, unlike the Falcon 9 booster.
Since 2022, there have been 601 booster landings, with two losses. (https://en.wikipedia.org/wiki/List_of_Falcon_9_first-stage_b...) That means that if you could have snuck onto one of the last 600 Falcon 9 boosters, with appropriate life support gear, your chances of survival would have been over four times higher than if you had snuck into the cargo bay for an SLS (space shuttle) launch, and that's with the SLS being designed to be manned, unlike the Falcon 9 booster.