LG panels are very high quality but considering LG recently announced that they are leaving the solar industry I would want to be sure the solar company is local and reputable. Fronius inverters are better than Sungrow.
However, the second quote is soooo cheap that it is far more concerning. I would worry that they will cut corners and do a poor quality installation at that price. Who is the installation company? Have you checked their reviews? Remember, you get what you pay for.