There's a lot of Squier Strats and similar models from other brands in that price range, new and used, that will sound fine and get the job done for you. The variance in QA is mostly going to be about the feel in your hands. Any individual guitar might have some sharp edges or a weird setup/tuning stability issue that takes more than the average amount of time/money to fix. I'd try to just actually play as many individual guitars as you can and see what feels good to you. You might find some oddball brand or model you didn't consider that sounds and plays great in your budget or you might just confirm which individual guitar between your current choices works for you best
If you don't want or need the tremolo (I know, it's actually vibrato), you can lock it down fairly easily, but if there's a hardtail model that fits, just go with that
If you don't want or need the tremolo (I know, it's actually vibrato), you can lock it down fairly easily, but if there's a hardtail model that fits, just go with that