PANS: I do a lot of my painting on site (Urban Sketchers is a great organization, search for a local chapter) so pans are convenient. And it makes it easy to replace a pan as needed. I took on old Prang school kids set and replaced the wells with individual half pans (glue 2 strips of metal to the case and glue strip magnet chips to the bottom of the pans. Leave space in the middle for a couple of brushes.). Then fill the pans with paint from tubes in layers letting each layer dry before loading the next. That minimizes cracking and shrinking.
PAINT QUALITY: As in almost everything, buy the best you can afford, even if it means fewer tubes. Student grade is lower than artists. I’ve tried several brands and like Daniel Smith for the balance of quality and price.