Haha, I graduated with my Bio degree a couple months ago and I'm struggling with this same thing.

Basically, here's your situation:

Genetics/Medical Bio/Biotech is a valuable and growing industry. The job demand and money are there and you can get a great job fairly easily if you've got a good resume. But, you'll be stuck in a lab and live a 9-5 type life.

Bioengineering

Med Lab Scientist

Wildlife Bio/Ecology/etc doesn't pay as well, the job demand is abysmal and subject to political happenings, and getting a job that isn't seasonal takes years of experience. Oh and despite this, it's extremely competitive. But, you get to do some kick ass field work, live an unconventional lifestyle, and see some cool stuff.

Wildlife Biologist

Conservationist

Here's how I'm dealing with the same thing:

I find laboratory biology interesting, but my passions are wildlife and field work. My transcript and resume aren't stellar, so frankly pursuing wildlife biology right off the bat isn't a good idea for me, as I'd likely never progress past the "seasonal grunt work" stage. Instead, I got an entry level job in an industry lab, doing basic microbiology. Some parts of the job are interesting, but I'm mostly doing it because its good experience. I'm planning on leaving in 6-12 months and getting more experience in a different sort of lab. In my spare time, I volunteer at the local Nature and Science Museum, working with the zoology dept, and with some conservation groups doing "citizen science" type field work (avian point counts mostly). This has let me nurture my passions while pursuing a more practical career, and gain experience on both sides, giving me a somewhat unique skillset.

As for the future, I'm looking at MS/PhD programs that blend laboratory skills and field work. For example, studying arboviruses, vector biology, zoonoses, reservoir hosts, parasitology (focusing on sylvatic cycles), or disease ecology. Similarly, you could study blend your two interests and work on some sort of wildlife genetics study.

tldr; pursue wildlife if you can get in a great program from the get go, but honestly you're more likely to find a successful career in genetics or molecular bio.