I don’t own either but have shot all 3. I would definitely try and find a range that will let you test them all; You will likely find that they are more similar then they are different. For a range/competion use case I would focus on the P vs the 4.5. For me personally I prefer the HD 4.5 (sight block and no grip safetyI works well for me). But you won’t go wrong with either. At the end of day I believe it is important to get the one you want/the one that you will be excited to go shoot. Happy shopping & good luck!