I've worked in Schaumburg for over a decade, and my friends and I have tried most, if not all of the Indian buffets around Schaumburg, so I can offer at least our perspective. Each person in my lunch group, and for that matter everyone in the office seems to have their favorite, so YMMV. And to the 'burb haters (a group to which I'll have to include myself), if you like Indian buffets, Schaumburg might actually be a better destination than Devon (buffets only!)
Gaylord is probably our group's favorite, although it's gotten pretty expensive for lunch lately. That's actually a good thing since we're slowly rediscovering other buffets as we add less expensive places to our rotation. Gaylord probably has the biggest selection and everything is always excellent. They also have pappadum and bel puri. A friend from Bangladesh consistently complains that the food isn't spicy (heat) enough, and he has a point. But I find the same point can be made about all the buffets. My favorite here has got to be indian seasoned fried fish which is unique (to Schaumburg) and excellent. Naan is delivered to the table. They consistently have excellent galub jamun, indian style ice cream, and kheer for dessert.
India Garden has returned to our rotation after falling off for a while a few years ago. The quality definitely seems to come and go over the years, but they seem to be back on their game right now. They bring out very good tandoori chicken and naan to the table.
New Delhi is kind of a more dreary, not quite as good version of India Garden. It's cheaper, and usually has a dish made on a wok, so for those that miss the Chinese/Indian fusion of Sizzle it might be an option. (Can't remember what they bring to your table). This is my least favorite. I don't recommend this place to people who ask.
Don't forget about Udupi Palace across the street from India Garden. They used to be all south Indian vegetarian food, but they now have a mixture of both north, south, veg, non-veg dishes these days that is middle of the road good. What's nice is that they have good idli and sambar, and they bring hot, crisp masala dosas to your table. Dessert is usually kheer and carrot halwa, neither of which is that good.
If you're willing to drive deep into Schaumburg, Priya is probably my favorite. I've only been a few times since it's so far away from the office, but Priya does things quite differently than the other buffets. The average dish probably isn't as good as Gaylord, but I get a distinct an-indian-grandmother-cooked-this vibe which means when they get it right, they hit it out of the park.
India House is too far away for lunch these days, but years ago it was quite good. (for what that's worth!)
And Sizzle India (RIP), no one misses this stinker. The quality and service just kept plummeting year after year, good riddance.
MJ
Udupi Palace Restaurant
730 E Schaumburg Rd, Schaumburg, IL
(847) 884-9510
Priya Indian Restaurant
939 W Wise Rd, Schaumburg, IL
(847) 301-2491
Gaylord India Restaurant
Schaumburg
555 Mall Dr Illinois (IL) Phone: (847) 619 3300
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India Garden
Schaumburg
855 E Schaumburg Rd Illinois (IL) Phone: (847) 524 3007
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New Delhi Restaurant
Schaumburg
30 S Meacham Road Illinois (IL) Phone: (847) 895 6900