Thank you.
I know I want to start studying in January, rather than July (the two options firm B offers). B fills their trainee studying slots intake on a first-come-first-served basis, and starting earlier is far more popular (HR told us that they really struggle to fill later slots). A's VS finishes around the time that B's second VS finishes and they start sending out further TC offers. If I wait and sign for B after having done A's scheme, I'd be quite a bit more likely to have to start studying in July. This is because, should I finish A's VS and then choose B's TC offer, everyone from B's second scheme will also want to start earlier (January) rather than later (July), and the earlier slots in January will have been filled up. At the moment there are still January slots available.
I'm torn because though I loved firm B - had an amazing time there and on paper they outrank A on every metric (comp, secondments etc) - it's still the only VS I've done. I feel that after I sign, there are little employment benefits of having done more VSs (e.g. if I decide to leave B, I'll be assessed in interviews on my grasp of deals, technicals, competency etc., rather than how many VSs I completed three years ago), but I'm uncertain about this latter point, and don't know what other benefits there might be. What would you do?