Want to fly helicopters?
Should have went Army warrant officer.
Best helo gig in the entire DoD.

If your goal is to fly for the airlines, however, definitely stay away from helicopters. It's not impossible to build the credentials to get hired by an airline, but it definitely limits your initial employment options and can be a huge setback in getting a seniority number at the airline you actually want to fly for.

As someone who is dual rated and has flown for the military, here are some of the pros and cons of each (my own opinion) --

Helicopter Pros
- More fun to fly overall
- More skill to properly finesse the aircraft
- Job-based missions are more diverse and rewarding
- Many jobs allow you to return home every night
- Higher initial pay
- Salary can be negotiated based off prior experience

Helicopter Cons
- Fewer jobs available
- Even fewer jobs available in desirable living locations
- More dangerous
- Pay caps out near major airline first officer pay
- Range is relatively short thus most jobs keep you in a local flying area

Airplane Pros
- Relatively more relaxing to fly
- Potential for high earnings in the latter half of your career
- Travel across the country with potential for international flights
- Abundant job openings and wider potential to live where you want
- Part 121 operations enjoy a very good safety record

Airplane Cons
- Instability throughout the industry (e.g. fuel costs, mergers, threats of cabotage, etc.)
- Initial pay is at poverty levels
- Career hinges on the almighty seniority number
- Lack of national seniority list can result in crippled career
- Potentially lots of time away from family


Those are all off the top of my head and I'm sure there's key points I might have missed, but that should at least get your mind thinking in what you want to do.