I suppose we should first define the main features of the MF.
As far as I know the MF was a heavily modified with military grade stuff (illegally!) light freighter.
It's main role was of a smuggler. It was not combat dedicated or a trader.
due to that we know that:
1. It is very fast and very nimble (could dance around Tie Fighters like a
pro)
2. It's capable of a decent (even if prone to fail

) warping engine
3. Had some sturdy shields to allow to absorb some hitting
4. Had as far as I recall 2 manned turrets which could destroy a tie fighter in a couple of pew-pews.
5. It had some cargo space for smuggling but not enough for heavy freight.
If we look at the ED most direct candidates it would be: Asp, Cobra and Lakon 6. (Lakong 7 and 9 are too big, not that nimble and basically dedicated heavy freight ships and Python and Anaconda are just too powerful combat wise).
The 3 ED main candidates conform in one way or other to the main 5 characteristics above but my choice is for the COBRA because:
- ASP: while perfect matching points 1, 2, 3 and 5 above, it feels to overpowered in terms of damage output. It's like a MF with an extra 4 manned turrets! So the feeling you get is for a more combat capable ship. The MF could do a bit of combat but it was more used for sneaking and dodging rather than full on pew-pew.
- Lakon 6: Severely laking on points 1 and 4.
- Cobra: (1) very nimble and fast, (2) decent enough size 3-4 FSD, (3) can fit nice shield gen and power distributor to make it survive long enough, (4) 4 hardpoints which may overpower the feeling of 2 manned turrets, it's not as powerful as an ASP or as lacking as a Lakon-6. Finally point 5: it has decent cargo space for its main purpose: smuggling.
Basically is a question of feeling: You want a ship that is perfect for smuggling: decent cargo, very fast and nimble and decent attack and defence to survive most of the fights. I feel that the best ship for that role is the COBRA in ED.