High chairs and boosters need to be stable and washable. Most have features you don't need.
My daughter's highchair was a hand-me-down. I think it was Graco, but most of the logo was scratched off. Besides the brand, it was missing the harness and the pad. It still had the double tray: a narrow bar over which fitted a bigger table. It turned out that I didn't need no harness and no pad. My daughter started eating real food at 9 month. She was very active and will not tolerate any restrain anyway: the first thing she learned about this chair is how to crawl in and out. She was also messy. The messiness of the sweet potato puree from the jar finally convinced me that babies can eat just what real people eat. Home-made yam puree washes from the walls and ceiling, but Gerber puree doesn't. Without the cushion I had one less thing to clean after every meal. She used with the table tray until she was 18 month, and next to the dining table after that. I never found out what the narrow tray was for. When she was almost three, she graduated to the dining chair with a booster. Most baby boosters are plastic, often in terrible colors. They have features like adjustable heigh or build-in toys. With their smooth hard underside they seem unstable. The one I got was Baby Cushion. It is made of some kind of foam, soft to sit on and doesn't slide from the wooden chairs. It comes in dark green and ugly purple. Unfortunately, this foam proves irresistible to teething siblings. Since ours was ugly purple anyway, I made a pillow sham for it which left exposed the grippy bottom. Now the booster didn't clash with the rest of the room and didn't slide. It survived only two of the three children and now is gone.
See also: children, newborn baby, jogging stroller, baby car seat, baby travel checklist.