LONDON - Canadian Bank capital markets FT or TMT M&A Boutique SA

Ok so I am not sure what to do. I am a final year at UK target studying finance.

I have a job offer paying above average at a Canadian Bank (Not RBC) in London for Capital Markets (SSA DCM) I like most of the team and the hours aren't too bad.

I also have a SA at a TMT M&A boutique in London that will almost certainly result in graduate offers (they are expanding) They have decent deal flow with good execution but at low valuation.

the canadian bank has terrible deal flow but is in the top 50 global investment banks and so has brand name. The fact that there is basically 0 dealflow (in the DCM business) would make a LT career difficult - meaning I would be a lifer, But it is a job and I would not want the stress of graduating without a job lined up.

the TMT boutique is quite small though but it is recognised (Arma/GP Bullhound/Torch Partners/DC Advisory) which would make the long term a bit easier to navigate - potentially coupled with a masters to lateral to EB.

The SA is for june-august 2019 (with a 2020 FT start) and the canadian FT is for august 2019 start... so obviously there is a clash

I am not sure if I am being to risk averse and so not too sure which to pick.