then this, IPS panel > TFT panel, because TFT panel sucks on side viewing, the colors become different, specially visible on older models. you can still use a TFT panel though the viewing angel is limited to direct face to face with a few degrees of allowance.
brand... well i cant tell much about this, but this, AOC is one of those cheap products thats really decent, ASUS and Samsung is like "meh, expensively beautiful..." and is on the same level while DELL is the kind of like "pay the name, not the product" but still, DELL makes some exceptional monitors.