Well, Both are very very different branches of Engineering. First of all, you need to ASK YOURSELF what you really want to do in life. Any engineering degree will give you a job which can pay you handsome money. But, the point is about enjoying the work you do, and so, you have to find out what you love most.
Why I say this is, I was confused, just like you when I almost made up my mind that I will do engineering, and then i chose to do B Tech in Mechanical Engineering. I had consulted a lot of seniors, people who worked in several fields etc before making my decision, and thought that Mechanical Engineering had several advantages over the others and so i joined the second best college in my state, Kerala.(The best is an REC/NIT, which was full, of course

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While I did the course, those 4 years taught me one thing, that I didn't really love Mechanical Engineering! Though I did not have much problems in understanding the concepts or getting marks in it. I kinda got my interest in computers, and I started to learn that too(well, not from class-room, on my own). And I found that I had real good interest in designing, visualising, photography, writing etc. Well, and finally when I was in the 3rd year(when the campus interviews came in), I did not appear in most and I just spend those last 2 years on playing football and in the luxury of being lazy. After college, I was still confused on what to do in life, what kinda job should I do and I spend some time thinking. ( 3-4 months). Then, I came to bangalore and thought I will just do any kinda job and so, I worked for one year a technical support for Apple. I took that job only for the love of computers and particularly the curiosity about Apple Macs. Then I quit the job as I lost interest, then I spend 4-5 months thinking on what I should do and meanwhile I was doing photography as a hobby and well, now, I am a photographer plus a Football Writer plus a Content Writer plus a Film Script writer. And, well, after 3 years of completing my Mechanical Engineering degree, I am now planning to do higher studies on 3 things I have found to be the best I love to do - Football (Writing/Admin), Movies (Scripting/Cinematography) and Photography (Advertising/Product)