I am relaxed now, but was natural for almost 3 years. In some ways I regret relaxing, in others I don't.
Either way, don't ever make a decision as important as this in the heat of the moment. Really consider whether you are going to deal with the problems that come from relaxers. I will list some of the pros and cons of both for you.
Pros of Natural
You are natural. Your hair is stronger
You can wear it straight (press, blowdry, flatiron)
You can wear it natural
Can wash and go (whether your hair is curly or kinky, you have this option)
Your hair is stronger (that's very important, so I said it again)
Can do a variety of styles, including wash/go, braids, twists, locks, plaits, bantu knots, etc.
If you get braids, when you take them out, the new growth is the same texture as the rest of the hair
It's softer (no matter how silky my relaxed hair feels, nothing was as baby soft as my natural hair)
You can add color, with less damage
Cons of Natural
Depending on how you wear your hair, it can be time consuming because it's thick.
Depending on your texture, you can get tangles
It may not shine as much as straight or relaxed hair
It often looks drier, although it is healthier, and just coils up, but is actually stronger
It may not look like its growing, but only because it is more tightly woven
Pros of Relaxer
Hair will be straight (or straighter than natural) without always having to use heat
Can do a variety of styles, including rollersets, wraps, braids, etc. and it will look silkier
Length will be more obvious
Cons of Relaxer
We all know this, but just to restate...
Damage, damage, damage to your hair and scalp, sometimes resulting in permanent loss
Requires great care to manage or it will break
Destroys your natural hair texture
Can be hazardous to your health (the jury is out)
Again, this wasn't meant to be an exhaustive list, but I just thought it would help.