I made it out of pools with 4th seed, top 4 made it out, there were 2 Snakes, 2 Olimars(one of them went Dedede games 2 and 3), a Kirby, and me, I went ROB against the Snakes except one game I went Peach but lost to both, I used Peach against the Olimar/Dedede and won, ROB against the other Olimar and lost game 3, and ROB against the Kirby and won. In bracket, I lost to a Falco, and then a ZSS. Tried Peach game 1 against the Falco, that MU is terrible and Peach can barely move, so went ROB and brought it to last hit game 3 after being down 174% to 0% last stock and almost got a clutch spike on him while he phantasm'd onto the stage, but he SDI'd onto the stage and barely lived. Then the ZSS, I brought that one to last hit game 3 as well, but couldn't get the final hit. I ended up getting 17th out of 33. It was an MK banned tournament, the Falco I fought first round usually plays MK, so I was happy about that. I wanted to use Peach more, but the MUs I had to play called for ROB more. Peach does better against ZSS, but I feel like I need a better offstage game to beat her, which my ROB has. Plus his glide toss is better, so getting an item piece does so much more for ROB than Peach, imo.
The main thing I took away from the tournament, is that my ROB is much better than my Peach in clutch situations, but that's probably because I've been playing him longer.
I'm muuuuuch more comfortable using Peach against MK. Being a smaller target and actually being able to airdodge while recovering high is amazing, among other advantages.
That ended up being more of a wall of text than I thought it would be.