No, I'm not steaming
It's easy to feel incredulous at my statement when Son is in his peak and best form of his life, whilst Rashford is probably in the worst form of his but lest we forget that Son is 5.5 years older than Rashford. Son wasn't the player he is now when he was 24 and if you look at their respective records up to that age then they're not too dissimilar(perhaps skewed by Rashford switching between LW and ST). Having seen every single minute Son has played for Spurs and plenty of Rashford I can honestly say that in terms of sheer ability there's really not that much between them at all. Son doesn't actually have many strings to his bow, in 80% of the game he's in fact decidedly very average, thankfully for us though he's among the elite in the other, arguably most important, 20%. Technically and physically/athletically there isn't much between them,
@Scroto Baggins makes a good point about Son being better off his weaker foot which makes him a dual-threat in certain situations but I'd also say Rashford's first touch, quick link-up play and close-quarter dribbling are all better than Son's - who can often look like he's trying to control an air-hockey puck.
I did qualify my statement with the suggestion that Rashford doesn't appear to have Son's mentality, a facet which is necessary for talent to flourish on a consistent basis. Maybe Rashford has just totally lost his focus and drive, or maybe he needs a change of scenery/different voice. It won't happen for many reasons(Son being one of them) but I reckon Conte would get way more out of him than what you're currently seeing.
Yeah, I don't know why he took my post that way but that's not what I was implying. My point was purely in terms of what Conte could do with a player of Rashford's ability, nothing to do with Son whose mentality has never been in question and has been playing at this level for 2-3 seasons now.
The main difference I see between the two are that one is in great form while the other is in a rut and Son has a clear drive to keep making those runs and making the most of his ability, whereas Rashford seems to be more focused on scoring PR points rather than goals. Son's positive attitude on and off the pitch are infectious as well, you could argue the same for Rashford but at the other end of the spectrum.