There is no good reason to refinish a model 10 that is in as good shape as the one pictured.
do either if you want to destroy it's character, heritage, and a chunk of it's monetary value!Should I have it reblued or parkerized.
Neither
There is no good reason to refinish a model 10 that is in as good shape as the one pictured.
A 4 inch heavy barrel is not a concealed carry gun, now bring the guys that disagree and carry 24/7/365 a larger revolver.
Home defense, target practice are the jobs your gun is best at.
Why does everyone feel the need to reblue guns? It generally destroys the value, and does almost nothing to protect the gun.
Your gun does not need refinishing, but if you must-first, look at the bluing. It will look the same again after a few months of carry if you reblue it.
At least refinish with an upgraded finish like hard chrome or nitriding. Even nickel holds up much better than bluing.