Thanks. They're both city firms but the 2024 one is a really big well known firm.
They both offer the seats I want.
That's a good point you mentioned about not being their long enough to recoup the salary.
I wouldn't mind that but I think the 2024 offer wants me to do 1 year SQE.
Yes - the two firms will offer you different opportunities, open different doors and offer different salaries. It may be useful to think about where you want to be in the next 5/8 years and which firm you think you will help you get there, you could also compare the salaries both firms will offer you over the next 5/8 years (taking into account your current salary when working out projections for the 'better' firm).
Often firms will allow you to join an earlier intake or do the LPC/SQE outside of London/part-time, if you have a good reason and speak to the right people in grad rec about your circumstances.
For example, I was able to join an earlier intake and sat the LPC at a slightly different time to the rest of my cohort. The 'better' firm may be more flexible knowing you have another offer (you're 'in-demand').
Others on here will have more experiences of negotiating with grad rec (my convo was really easy). But there is no harm in having these conversations with the 'better firm', especially if they are one of the bigger firms (e.g. it only takes one person in an earlier intake to drop-out/want to defer and a place could be available for you).