This study reports the surgical outcomes of both the Ahmed (AGV) and Baerveldt (BGI) glaucoma drainage implants in a cohort of patients with primary congenital glaucoma over a long follow-up in a single tertiary centre. This was a retrospective study of cases <16 years of age over a 10-year period. One-hundred-and-fifty-three eyes of 86 patients were reviewed: 19 AGV and 67 BGI groups. Children were significantly older in the BGI group than AGV: 8.9 ±13.5 months vs. 3.3 ±7.8 months. There was no significant difference between groups for gender, number of glaucoma medications or follow-up period. The number of children with more than one previous glaucoma procedure was significantly higher in the AGV group: 53.3% vs. 21.2%. There was no significant difference between groups for specific postoperative complications but there was significant difference for overall number of complications: 60.8% for AGV vs. 36.4% for BVI. There were also significantly more postoperative revisions and reoperations for AGV: 29.2% vs. 12.1%. The results show both surgical methods are successful in providing adequate intraocular pressure control in the first few postoperative years. However, there are differences in long-term outcomes. Baerveldt had significantly lower mean intraocular pressure, a higher surgical success rate and less complications. The authors note the limitation of their retrospective study design and recommend future prospective clinical trials.