Op prime either way, both are just as safe. No matter wich one you choose there will be loose primers in the tray.
When I started reloading I used the press primer (Lee) and had no issues, I even was able to "feel" the primer the way I did it.
Today I prime off the press, not for feel or safety reasons, but for me it speeds up the process for my reloading.
Find the method that works for you!
When seconds count, why is help minutes away?