I am familiar with both. Im not a fan of weight gainers. I am, but Im not. I wouldnt ever purchase one from an online store or whatever, dont get me wrong gainers are great for getting those calories you need and what not, be careful of the sugar content in them. The majority are low in fat, but make up the fat calories in the form of simple sugar carbohydrates. If anything, save your money and make your own weight gainer/meal replacement shake. Along with that, wardog has provided us with an excellent recipe for bulking protein bars, here are the recipes for each:
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Both of those will get the job done, and cost you much less. Best of luck.