Shalom Aleikhom. Provided that it is true that evidence exists that the prophet used to raise his hands at times, and at other times the prophet never raised his hands, I would have to take it that both are ok. If both are ok, then I think it depends on the person who is doing it to decide if she/he wants to do it or not.
Regarding "who" to follow , every other person you ask may answer with a different and contradictory answer. This is a direct result of divisions made by people in the deen. Or is anyone telling you to follow Mr. X/Mr. Y top to bottom because he she is more "knowledgeable" ? If you yourself dont have the knowledge, how do you know that the person is "knowledgeable" ? Do they not have scholars who study Christiany/Judaism/Hinduism for life but still invite people to the wrong path ?
"And the example of those who disbelieve is like one who repeats what he has heard of calls and cries; deaf, dumb, and blind, they do not comprehend." [Qur'an 2:171] "And do not uphold what you have no knowledge of. For the hearing, eyesight, and heart, all these you are responsible for." [Qur'an 17:36]
Ask God for guidance and carry on with your striving for the sake of Allah, inshallah, you will walk in his straight path.