I have never been to either one of them but I heard that both of them are really good. I've been trying to get Ohana' as a reservation. I hope you enjoy both !Hey guys. Have not been to either of them, but we have reservations for both. Can you all give me some pros and cons of each?

I can't give an opinion on Ohana cause I've never been there. Everytime I make a reservation for it by the time the trip comes up, I have cancelled it.
On the other hand, I tried Garden Grill for the first time on my last trip and it was mine and my husband's favorite restaurant of the trip. The character interaction was great, viewing different scenes of Living with the Land was neat, and the food was awesome. For my next trip, I have again booked Garden Grill (although Idk if I want to do it for breakfast or lunch since they opened those for November) and once again booked Ohana but I am already planning on cutting it once again in favor of a different restaurant.
Ohana is great. Love the food and atmosphere. As far as the Garden Grill that is the only table serve we've been too that would not go back to. The food was very poor in my opinion and the service seemed intent on getting us out in under 20 minutes. Which I guess was fine because it got us to the World Showcase quicker so we could get quality food unlike the instant mashed potatoes and tough meat we were served.
Garden Grill - food is (just) OK, some components are straight out of the box mixes, good character interaction, good service, there will be something for everyone to like.

Again, where are we getting these "straight out of the box" mixes?? What examples are you talking about? If you say the mashed potatoes, there is NO way that is straight out of the box. They are our one of our favorite items and we always ask for seconds. I can't speak for the kids food...maybe the mac and cheese? Unless I am mistaken and you know someone who works there that says they are straight out of the box, I wouldn't make such assumptions.
Dislike of an item's taste doesn't necessarily mean "out of the box"
It's a known fact they use many food items from their "Living with the Land" ride ,right? Potatoes would be included with that, correct?
This review is unfair of Garden Grill. While I agree the meat can vary from experience to experience, the mashed potatoes are NOT instant and are completely fresh. Please, when trying to state reviews of a place, at least say things that are truthful.
As far as the two places, I do prefer 'Ohana, but only by a smidge. 'Ohana has great food, but sometimes you can feel rushed there. I'm glad they brought the salad back, but am still sad they got rid of the turkey and pork. TOO much chicken in my opinion, but you can't beat the Polynesian!
Garden Grill has GREAT character interaction AND great atmosphere. My favorite food there is the salad....but the other items are definitely great as well.
Good luck trying to choose. If you can figure out a way to do both, I would try to prio these two. They are two of our favorite restaurant experiences (again, experiences (food might not always be the best)) in all of WDW.