Imo the most likely scenario is that death battle is gonna primarily use part 1, shippuden and the last versions of rock lee. I mean having an EOS 30-something year old adult rock lee go up against a young adult sanji just makes no sense. And besides, it should be practically impossible to use boruto lee since theres literally no feats to analyze, youd just be going by things people have said, for example we know boruto lee has access to all 8 gates, however we've never actually seen rock lee use the 8th OR the 7th gate(to my knowledge), so again, theres nothing to analyze, no feats.
This should essentially mean that while rock lees trump card is the 6th gate, sanjis is the raid suit, and i feel like the raid suit is definitely superior, since lees 6th gate offers a boost in speed and power, meanwhile the raid suit also offers a speed+power boost, but it also significantly boosts sanjis durability. And I honestly don't see 6th gate breaking through sanjis defense.
Theres also the fact that rock lee doesnt have anything to counter sanjis invisibility.