This has got to be such an unfair and one-sided battle.
- Tenrou Bluenote > Tower of Heaven Jellal [Medium Difficulty at Max]
There is literally only one reason why Bluenote would have trouble in this fight. That would be being out-ranged hence the Medium Difficulty. Otherwise, Bluenote is superior to Jellal in almost every stat. This was the guy who was called Ace of Grimoire Heart, the 2nd strongest guild in the Baram Alliance. This was the guy who overwhelmed Natsu, Wendy, Cana, etc. This was the guy who stood up against Tenrou Gildarts. Note that I said stood up and not beat, meaning that he is weaker than him; however, I'll be using Gildarts a lot more as an example.
Jellal's only real feats in which the outcome has been decided is standing up to Tower of Heaven DF Natsu and soloing Oración Seis. There may be a few more minor instances but either way, I don't even think GMG Jellal can beat Tenrou Gildarts... Let alone Tower of Heaven Jellal.
Gildarts is almost on the same level of Mard Geer if not higher. Tartaros DF Natsu can't beat Mard Geer. So Tower of Heaven Natsu is way weaker.
Natsu didn't one-shot Bluenote until after the timeskip in Pre-Alvarez Arc... And he did a lot of training during that time. So, Tartaros DF Natsu may well be on par with Bluenote. If not, either a little stronger or weaker but not by much.
As you can see, Bluenote's feats have shown enough to say that he takes this over Jellal. No doubt. This thread, however, would probably be more difficult to assess had it been GMG Jellal and Tenrou Bluenote.