Let's not rewrite history. Anybody that saw Januzaj play for the u21s knew he was usually the best player on the pitch even without the goals or assists. He was brilliant at bringing others into play and starting great attacks. Completely different type of player to Greenwood. He did become less of a team player at first team level though and that coupled with his attitude let him down. He seems to have made it work though after a couple of years.
Januzaj was incredible and looked nailed on to be a starter here. Don't let the fact that he flamed out muddy your memory of how good he was in his breakthrough season, and in the youth side before that. That said, I do agree that Greenwood has a ton of potential and is one of the better prospects to come through in recent years. I certainly see more in him than I ever saw in James Wilson, who was held up as a top-level prospect by our fans.
As someone who also rated James Wilson (hard not to when he was a great finisher), and having looked back at his skill set and scoring numbers, it's clear to see that Greenwood is on another level. A lot on this board retrospectively make Wilson feel like he was an Ashley Fletcher type talent. Wilson was a good finisher with both feet, but he wasn't two footed like Greenwood is. He also didn't have nearly the level of technique as Greenwood does. He's certainly faster than Greenwood is, but due to Greenwood being a #10, Greenwood is much better at bringing others into play, creating for others, and being part of the overall team. I actually think Greenwood is better at delivering final balls than Januzaj was. Think Januzaj had a better eye to give a through ball, but Greenwood's weight of pass for that final ball is better in my eyes.
Even if we compare scoring numbers, Greenwood easily comes out on top despite being younger than when Wilson had his great season. If Greenwood is the standard of what it takes to make it at the highest level, then it's a fact that a lot of us who rated Wilson at the time were naive in regards to the level required to make the step up. It's a good lesson for us and we're better off judging future strikers in our system here on out.
Which leads me to Rashford who also started off as a #10 before being converted into a striker. As a #10, Greenwood's vision was better, and his overall team play was better. Personally think Rashford is the more explosive player of the two, but Greenwood's technical ability is a little tighter than Rashford's. Then you combine finishing ability and Greenwood easily comes out on top (Rashford's wasn't as good as Wilson's). In other words, as a #10 I think Greenwood is the superior talent, and as a #9 I think Greenwood is the superior talent.