I can see two arguments:

1) ba y and don’t pay to assign seats. Just because that’s cheapest and saves you cash

2) dl y via kl and don’t pay for comfort plus. Because it would be the most pleasant: two window/aisle pairs, no neighbours, and much better transfer experience with no need to reculera security in either direction nor passport control (which will be fast upon arrival at inv).

with the seat fees the difference is small enough that I’d go dl. If you are happy to wait till t-72 on ba the savings become a bit greater.