Tubulars on average deflate slower than clinchers. Not always but mostly. A well glued tubular doesn't roll. So yeah, overall tubulars are safer than clinchers.
Tubulars are a hassle to glue and repair though.
I'd consider tubeless. I've done a dozen wheelsets at this point for myself and teammates. Zero negative feedback.
With the new tires that are out there they blow away any clincher, and the only advantage tubulars have is weight in some cases. I've swapped over to tubeless on everything but my track wheels and my blingy rear TT disc.