It really depends on the type of riding you want to do and your budget.
MTB (mountain bikes) are very durable and will work technical off road better than anything else. They are okay for street riding but even better if you substitute narrower higher pressure tires.
Road bikes are made for efficiency on paved roads. You will be able to go further and faster with less energy on paved roads than with other styles of bikes. They are not as durable as MTB's.
Trail and hybrids are an attempt to compromise between MTB's and road bikes, plus provide a seating position more preferred by casual cyclists.
Once you figure out your budget and what type of riding style/frame style you want, I would repost your question in the appropriate forum. Suggestions would be Trail/hybrid - Recreational/Utility, MTB - Mountain Biking, Road - Road Cycling/Touring. Other forums may pique your fancy, like Recumbent, Tandem, Folding, Commuting, Classic & Vintage or even BMX.