The funny thing is after a few pages of pretty hilarious shit slinging we seem to be agreed that if we were to play both in a front three the best bet would be: Martial - Lukaku - Rashford
I also like the sound of Martial in the hole behind Lukaku or with him in a 3-5-2.
As to the question of playing both v maintaining Jose's plan of having them share the left I'm comfortable with the latter for now, allowing us to own the left hand side for 90 minutes. The combination of Rashford for 65/70 and Martial for 20+ has worked for us several times this season, including this weekend in a big game. However it's clear these two could be great attackers for us for years to come, so Jose will need to start coming up with a way of including both in a starting line-up.
I would not be content with the current state of play forever, and nor I imagine would the two players in question, but Jose will surely have discussed with them how highly he rates them and, I suspect, his plans for how to utilise them in future. I don't see the 70/20 on the left being a long-term solution but nor am I desperate to see both these lads start. It's working for now, the players are developing nicely, why rush into a change?