I'm actually on the opposite side of this debate, I think Ranger-Captain is better that the original. Unless you have variable 1 cost creatures you can pick up and deploy later like
Walking Ballista or
Mikaeus, the Lunarch, Ranger feels a little lackluster tutoring up 1 drops in the latter portions of a game. That's likely more a function of my environment with the majority of 1 drops leaning towards aggressive strategies where a 1 drop isn't quite as impactful on T5 (Unless it's
Mother of Runes or
Giver of Runes I suppose). I've found in the majority of cases that I usually only have one target I really want to pick up at that point in the game anyway.
I feel like Ranger-Captain is better in a greater variety of decks. It's 1 cheaper to deploy, tutors up one thing to your hand, and that sacrifice ability actually helps branch an aggressive deck into the later game and can fade that T4 Wrath to give you the opening to close out the game. If I had to choose one, I'd go with the Ranger-Captain, but like Onder mentioned white doesn't get a whole lot of card advantage tools. I'd play both in your list if you have the space.