Help: M&A Analyst or Risk Control Analyst Position?

I’m likely to get two job offers this coming week. Need y’all’s input picking one. Salary’s likely to be the same, so really the hard part is determining career pathway potential and future opportunities.

One job is an M&A Analyst role with a growing business consolidator in a single industry. It seems to be doing very well, is fairly new, has a start up vibe to it.

The other is a risk control analyst position for a large oil & natural gas firm, where I’d be given a large portfolio of derivatives (mostly futures, some options and swaps) and would assist the firm in hedging price risk of their deliverables.

I’m torn, because I like the idea of M&A work, but worry that being a start-up, I might have to deal with company growing pains and I have no idea how the business will weather the next economic downtown. The oil & natural gas company however is a Fortune 50 firm, lots of resources, solid job security, but the management seems to be “old school” (old ways of doing things, outdated technology, etc.). I am also not sure about attaching myself to the fossil fuel industry.

What say y’all? Thanks!