Many people who work or have worked at regionals are likely to classify management, training, workload, and infrastructure as substandard. That's the nature of regionals. Their potential for profit is mostly fixed, and they have to work within that constraint. I work at one currently, and I could tell you this-that-and-the-other as far as its deficiencies as a company. That being said, it is a dispatching job from which I accumulating Part 121 dispatch experience, which is the real pearl in the oyster that new dispatchers with aspirations toward the big carriers should focus on. Any regional you go to will frustrate you. For all the negativity in this thread about PSA, I have heard just as much through the grapevine about Republic.
If your best job offer is from PSA, take it and do what you can to be the best dispatcher possible within the limitations afforded by that company. If it really just isn't your brand of vodka, at least you will have the experience required to be a no-brainer candidate at any other regional that you find more desirable.