I thought this was the better of the two, I love Starlight and Trixie interaction, and Trixie she is adorable when she screws up. And we had a B plot with the mane 6, and they connected, which a lot of shows that do A and B plot, there plots don't connect.
Yes Trixie is a jerk, but doesn't make her a bad living being, they are some in the mane 6 that can be jerks sometimes coughRainbow Dashcough. In fact this plot could have easily worked with Twilight / Rarity and Rainbow Dash.
Seeing Starlight fume was hilarious, and the other ponies getting angry at Trixie and Trixie's reaction was priceless, Trixie saying she didn't know Granny Smith had a past, most of Granny Smith life is her past. Ha ha ha. And poor Spike caught in the middle of all this madness.
As for the other plot, loved the song and it cost them the record.