Sell-Side M&A vs. Capital Markets Advisory

I've been working at a lower MM boutique IB for the past few years doing sell-side M&A work.  While the work is interesting I'm frustrated by the fact that so many sell-side deals seem to fall through (~50%).  Thinking of transitioning into capital markets advisory doing equity and debt capital raises for companies as this seems to be a bit more predictable in terms of deal success rate.  Any feedback on the two paths would be appreciated.