I was once a huge fan of Disney as well, but we slowly started visiting Universal when we came down to Disney, and now we rarely visit Disney anymore.
Sure, Universal does not have that "magic" that Disney does, but Universal has its own kind. Staying on-site at Universal, while it is more than some hotels at Disney, its not as bad as the Deluxe hotels at Disney. I also think the hotels at Universal are BETTER than the Deluxe at Disney when it comes to comfort in the rooms. All three on-site hotels have great pools, theming, etc. Also, you get the amazing benefit of the Express line at nearly every ride in the park. This Express line works like Fastpass...without having to wait for a return time! Simply show your room key to the TM at the front of the line and you will get to enter the Express line and be riding the ride in about 5-10 minutes. Such a great perk!
As far as rides go, it depends on what you like? Do you like thrill rides like Tower of Terror, Rock in Rollercoaster, Everest, Splash Mountain? Or do you like rides more tame like Haunted Mansion, Pirates, Soarin? If you enjoy the thrill rides, Universal is for you! Universal has only a few rides where you simply sit in a car and move from room to room to see a scene (like Haunted Mansion). Instead, universal takes that concept and expands on it. Take a ride like Star Tours, place it on a flat track that moves 360 degrees, toss in some fire and water, and you have a Universal ride like Spiderman. The rides all have a lot of theming and story telling just like Disney, but they are geared more for an "older" crowd and not designed for the younger kids like Disney.
Also, since you will be going in October, Halloween Horror Nights will be going on. If you enjoy going to your local haunted house during this time of year, this event at Universal will blow you away! It is a very intense event that takes place in the whole park with roughly 8 haunted houses and some extreme themeing.
Overall, it really depends on how long you want to travel for and what type of rides you enjoy. Both places have shows, mild rides, and thrill rides, but Universal has more of the thrill rides. If you do go, you really need to stay onsite. The express pass alone makes it worth it, not to mention not having to drive or ride buses. Simply board the boats that dock right outside your hotel and enjoy a nice boat ride to Citywalk where it is only a short walk to either park.
If you are going to be in Orlando for a week or more, consider doing Universal for 2 or 3 nights and Disney for the rest. With the express pass, you do not need many days to see both the parks. This will allow you to do both places and let you test out Universal. We started with just one day, which quickly changed to 3 days, and then a bunch of trips for four nights. The next trip will be 7 days, and I can't wait.