It's better in the sense that you get a video answer and explanation for every question, but if you have more than 2 months to study, you'll probably run out of questions. You can find a huge book of questions for cheap as a supplement. If you search for it you can probably find an electronic version somewhere. I did all of Magoosh and all of the 5 lb. Book. In the end, I met the minimum score I wanted, so it was worth it because I was accepted into my first choice... but god damn, fuck the GRE. I hope your death is quicker and less painful than mine haha.
I used a traditional GRE prep book with GRE flash cards which helped me jump 10% in quantitative and 20% in qualitative.
this is pretty popular as a compendium of old questions. you can pick it up at the library or buy it used on amazon.
https://www.amazon.com/lb-Book-GRE-Practice-Problems/dp/1937707296
I'd say don't take a class. You'll be paying a lot of money for a generalized approach intended to strengthen a bunch of peoples' GRE scores, instead of focusing on what you need help with. Suck at verbal and good at quant? A class isn't going to spend more time on verbal just because you suck at it.
I'd recommend hiring a good private tutor and/or joining Magoosh. Magoosh is $80 for six months and it's by far the best prep material I've found. It's all online and has videos teaching you different types of material. Those are like a Khan Academy for GRE prep. They also have questions and a quiz mode, so they throw questions at you and also give you an estimated score range based on how many you get right. The questions are much harder than the real GRE so they prep you really, really well.
I'd say also get the Manhattan Prep 5-lb Book of GRE Problems. They're really good, reasonably challenging, and harder than the real test. They don't teach you "tricks" as much as teach you the actual material you need. Avoid Kaplan and Princeton Review like the plague, since their questions often have a lot of typos and aren't good prep. Also for sure get the Official Guide to the GRE, since it's the only place to get official ETS questions. They resemble the ones on the actual test the most. If you're having trouble with a particular topic, Manhattan Prep also sells guides for individual subjects like word problems and geometry that are really good. ETS also sells books of Quantitative and Verbal questions for extra practice.
Good luck!