Looking at the current conditions I think Lens is still quite better so far.
Indeed, currently their position is below Marseille, but from the statistics they lost, they are better than Marseille, even though there were indeed a number of draws that were far more numerous. Apart from that, looking at their defense they are also quite good and have even been the club that has conceded the fewest goals so far.
The defeat against PSG started with a red card so it was difficult even though they worked really hard during that game.
Marseille will face Lens next week and that game will be very important for their conquest for the remaining Champions League spot. They will face Lille also in a month so I expect them to collect many points for their remaining games.
Lens have Reims and Lorient that might be challenging a bit, otherwise I expect them to collect many points too. That's why the game between them will be very important!