I would not recommend making united your"go to" airline. We've used united for over 40 years as often as we could. My husband has held Premier status for years.
In April his united flight arrived late to Denver so my husband missed his connecting flight. Two different gate agents refused to help each sending him to customer service. The customer service line had over 100 people in it and my husband had to get home by nightfall due to a business trip to Africa. He waited in this line for over 2 hours but was still behind 40 people when he had to pull out of line to catch the last flight of the day which I had booked for him.
We tried everything to get united to reimburse us for this flight but they honestly didn't seen to be concerned about it. So much for Premier status!