[UK] 3-month Internship or 12-month placement between final years at FAANG?

Hi all,

I am a CS student in the UK approaching the end of my penultimate year. I have an offer with a very big tech company (extremely happy with it) for a 3-month summer internship, but I am able to do a 12-month placement year with them as well, where I would delay my graduation by a year and work there for 12 months, before returning to finish my final year of university and then graduate.

some pros of 12mo

is 3mo enough time to shine? 12mo allows me more time to show that I deserve the return offer, as well as network and meet people

if I don't get the return offer, I'm in a better position for other jobs and have achieved good pay that other places may not give me.

Having 1yoe means offers I get after graduation may be a higher salary.

Get to be a student for an extra year? around friends, societies, etc (it's in the same city I live in and go to University in so not a big difference)

cons

I graduate later, so that's 1 year I could've worked on a grad salary earning more (assuming return offer). Also, I'm very young so delaying start to the work force isn't terrible.

The "extra experience" will be gained after I graduate anyway, so it's not really much of a benefit.

most interns do 3 months and a lot of them get return offers, shouldn't matter, as the chances of a return are the same so either path ends the same.

3 months at this company in a fast-paced environment already provides lots of experience.

the CV boost will be the same either way, passing resume screenings will improve by the same amount.

I don't think either is a bad decision, I'm just unsure as to which is a better one, and I'm completely torn right now and was wondering if there was any guidance available.

Thanks!