There's nothing inherently different about the safety vs decocker from a safety standpoint. Either could have no firing pin block and be safe in competition (assuming the gun isn't dropped with the hammer resting on the firing pin).
I'm fully aware of the different models and their differences. Just because CZ declared and built the current shadow with a safety doesn't mean they couldn't make a shadow with a decocker.
Current USPSA rules allow decockers to decock to half cock but safety models have to go to fully hammer down. This is a slight advantage but an advantage none the less. That is my primary motivation. USPSA should change the rule to allow safety models run at half cock as well. Not having to manually lower the hammer fully every make ready is just a bonus.
As to whether the trigger is worst on a decocker vs a standard, that is boloney. Sure a Shadow has a slightly better/shorter reset due to the lack of firing pin block but they all can be tuned to run about the same, especially comparing a standard SP01 to a SP01 Tactical or a standard 75B to a 75BD. I'd be happy to put up my Tactical against any of your tuned Shadows. People talk about decockers as if they are inferior and not as tunable. They are completely tunable and infact they have a more stable sear cage (aside from the TS variants) due to the cage being pinned to the frame by the sear pin. Safety models are not pinned to the frame and thus the cage is free to move around ever so slightly making the trigger feel less crisp. This is why folks have come up with ways to stabilize the sear cage on safety model guns over the years. Decocker sear cages are already pinned to the frame and move less from the factory.
The funny thing is the Shadow lineup of pistols are designed and built to be used in competition where the rules state you have to start hammer fully down. Thus the locked and cocked arguement is null and void. I guess you could run them in limited if you really wanted to be hamstrung on capacity and PF. The fact they don't have a firing pin block does make them less safe when used for defensive carry applications. I could think of better guns to be used for carry anyways due to the heft of an all steel Shadow/Shadow 2.
That is my $0.02.
Cheers,
Toby