Quickly summarizing my thoughts on each season of the Burst anime:
(My thoughts do differ regarding the manga versions)
S1: A bit slow for my tastes, but overall very solid. It laid a lot of good groundwork, and I loved the final battle's result. My only complaint is that the cast was quite bloated.
God: Takes the groundwork S1 laid and goes crazy with it. The middle is quite slow, and there are missed opportunities, but the peaks God reaches are some of the highest in the franchise.
Chozetsu: My least favorite Burst season, all things considered. It had cool concepts but used them in very shallow ways. I didn't like Aiga as a character, and the other characters I did like (For example Fubuki) were barely used in any meaningful way. I also felt that the ending was quite unearned.
GT: I love this season. It feels like it incorporated a lot of good elements that were previously left behind in S1. The main cast was super likable and fleshed out, and the overall plot had lots of fun twists and turns. The animation was also kicked up a notch. My only complaint is that Arthur was a bit shallow, Gwyn does make up for him though.
Sparking: This series is quite controversial, and while it had its ups and downs, I think the highs make the lows worth it. Despite having a very large cast they manage to give a good chunk of focus to each Legend. Lain was handled quite poorly at first, but his character got really good starting with Lucifer The End, and I love how they portrayed his relationship with Shu. Not to mention that the animation got even better, and peaked during this season. My only main complaint is the twins. They are fun characters but lack substance.
DB: Watching this series gave me mixed signals, but I do like it. I think that the characters were really good, but the plot was quite bland. Sitting through said plot was quite boring, but I love the ways it pushed characters together and made them clash with each other. Also, shout out to Basara. No one seems to talk about him but he's but favorite secondary rival in all of Burst.
Quick opening ranking since I'm listening to one right now:
1. Chozetsu Muteki Blader:
The undisputed Goat. The song is a bop, and the visuals are gorgeous.
2. Clash Dynamite Battle:
Just as good as number one, but Chozetsu Muteki Blader wins because of its length.
3. Gatti 'n' Roll:
Big fan of this opening, it has a fun and unique energy that never gets old.
4. Sparking Revolution:
It took a while for the song to grow on me, but I do like it. Also, the visuals in the later versions are amazing.
5. Evolution Burst:
A bit standard, but the visuals in the later version are top-notch.
6. Burst Finish:
The most boring Opening here compared to the others. It does get a point for actually having a full version though.