I didn't bring this up in my earlier posts because I didn't think it was meaningful, but since many have raised the issue, I’ll share my thoughts now.
Westminster boys receive a higher percentage of Oxbridge offers compared to those from SP.
As an offer holder, you might want to check with the school for more detailed information, but even with the data available to the public, it's fairly easy to analyse.
43% of Westminsters received Oxbridge offers (90/211), while 22% of SP boys did (40/175). Based on the total Westminster's sixth form students of 211, girls would be up to 70 and boys at least 140. It's worth noting that the new entrants in Westminster's sixth form are mostly female.
To put it simply, for Westminster boys to match SP's Oxbridge rate of 22%, almost every girl at Westminster would need to secure Oxbridge placements. This scenario assumes that almost no Westminster girl would attend any other universities like Imperial, LSE, or any Ivy League schools, which is far from the truth.
This is why I wouldn't encourage my daughter to switch to Westminster solely for Oxbridge, unless she has a strong preference for a co-ed environment and is focused on a STEM degree, where school and peer support can sometimes be lacking in certain girls' schools.
From what I know, the cohort I’m familiar with had about 50% of the girls and around 40% of the boys receiving Oxbridge offers, although this can vary each year.
When looking at boys and girls separately, the Oxbridge rates likely rank as follows: Westminster girls, then SPGS (40% with 44 out of 110), followed by Westminster boys, and then other schools. The girls outperforming boys anywhere is becoming less surprising and is a topic itself.
No doubt, someone will argue that a few boys might choose Harvard over an Oxbridge offer, and my figures could be off by one or two students and etc. Nevertheless, the overall picture stands the same. Oxbridge statistics exist, they shouldn't be a primary consideration when selecting a school. That said, there's also no point denying that Westminster boys have the highest Oxbridge rate among boys from any school.
Factors beyond teaching quality, such as selectivity, significantly influence Oxbridge rates. Your son is likely to do well at either school, so I believe that you can trust your instincts and go for the school you think he will spend the happiest years. If my son had gone to SP, he would have become just as fine a young man as he is at Westminster. Congratulations again.