In this regard, how can anyone possible speculate about your #3 & #4(???)

Back on the planet earth, I see #1 or #2 as feasible choices, although your comments regarding #1 seem awfully similar to #3 & #4. Your comments about a phone model being slow tells me you haven't really taken the time yet to test them out in person. It's a must if you are comparing models which you have little experience, especially if they are carrier branded. Android is a whole different enchilada than your familiar iOS device you got rid of. Bloatware simply means extra software installed by the carrier. That may or may not affect your particular use of the device. Again, test it out personally to see if it matters at all. Sometimes the sheer speed of the handset, along with a fast LTE network can negate any issues with software that cannot be removed w/o flashing to a custom ROM.

I suggest visiting Howardforums.com for better feedback on the models you seem to be focusing on.