That's fair, I think.
Dresden was horrific, and ought to be formally acknowledged as a war crime. Still, I don't think you can say it was worse than what is happening to Gaza, from any perspective except maybe in horror per day. They are similarly sized, but Gaza is more densely populated. If you had the terrible choice between nearly 4000 tons over 3 days, or 85,000+ tons over 14 months, I think I know what you would choose.
I would also point out that global awareness of what was happening in Dresden was many orders of magnitude lower than awareness of Gaza's bombing, and the military 'justification' far worse.
Leuna works was a key strategic target with a 13 square km area; I wouldn't see it as an appropriate comparison.
