Hi all! Looking for some advice

For background, I've been slightly stalking this forum without an account for a few months now!
I am incredibly grateful to have secured a TC and VS at two different firms over the past few weeks (unfortunately under confidentiality agreement with both atm!). I am absolutely going to accept the TC offer, since it is probably my 1st choice firm. However, the VS offer is at my 2nd choice firm, and in a completely different area of law to the 1st choice! Therefore, I would love to gain the experience offered at the VS firm for my future career.
I have received my VS firm contract which does not say anything about having a TC at another firm, but I am yet to receive my TC contract whilst they check references. I need to sign my VS offer by Wednesday. I am also unsure what to do when it comes to the AC at the end of the VS.
I would love your advice about what to do in this position!
P.S. I truly hope this doesn't come across as showing off or tone deaf; I have really enjoyed the insights on this forum so far so would love your POV. Thank you!! <3