No, generally around the same or less, esp for Orlando. It is a little apples to oranges in some ways though. Historically and resale we're talking full week options floating for a season for Marriott. Comparing to say Marriott's Grande Vista resort would be a fair comparison for say OKW or SSR in a 2 BR for a week, say 300 points to be conservative and fair. One could buy SSR for say $50 a point or roughly $15K and roughly $1500 yearly. A top season (Platinum) Marriott GV unit can be bought easily for under $4000 with yearly fees around $1050. The numbers would vary a little by property. For example, Harbour Lakes would be cheaper up front and yearly, Cypress Harbour would be cheaper to buy but around the same yearly and is likely more comparable to OKW. There are ways to get cheaper still overall but they including exchanges from smaller to larger units and the use of bonus weeks, all very workable for Orlando though. The studios at GV are also much better than the DVC studios in that they are larger, have a king bed and actually have utensils and cooking materials.
There is the rest of the story though. DVC is more flexible in direct usage than is Marriott which is a week at a time during a season though the Marriott can be broken down into 3 & 4 day options and locked off into a studio & 1 BR. There would be a lockoff fee normally $75. For Marriott you could exchange directly to the other Florida club options (West Palm, Panama City, Doral & Ft. Lauderdale) and you could use the 3/4 day and lockoff options at those locations as well. You'd have to join II at your own cost to exchange it to other Marriott's and beyond but you'd have a lot more options, flexibility and better choices OVERALL than you would have using DVC for exchanging. So in the end Marriott maybe $1200 yearly and DVC $1500 without exchanging but with the ability to do so, if the difference forces a car rental, one would have to consider that as well.
What off property tends to do for the higher end options is given you more & better recreational options, more activities and more space for a somewhat cheaper price and more better exchange options. Ultimately it comes down to preference and how one will use it. In general DVC is more expensive yearly but it varies with usage patterns. Marriott is a much better trading tool. If you go up to the 3 BR at GV, the numbers are far more favorable to Marriott than DVC but you have the same basic limitations.
For those that know some of this well, I have ignored the newer Marriott trust points and the Destination points because they either aren't available or workable for this situation.
If you compare to the 2 main points mini systems for Orlando that I have some familiarity with (Bluegreen & Wyndham), you drop your initial buy in costs down to around $1000 give or take for enough points to get a 2 BR and dues in the range of the Marriott GV I mentioned and less than DVC (variable for Wyndham). You pick up a lot more options, have the exchange options internally and through RCI included other than the exchange fee if you go through RCI (like DVC but the costs tend to be higher but with more options). Plus you have the potential to exchange in to DVC as well. I can't speak for Worldmark or Hilton, the other 2 systems I'd include in this group. WM doesn't have the same level of direct Orlando options but is well suited out west. I suspect Hilton is more to buy in but the other principles would apply somewhat.
IMO it boils down to how much you want to pay for on property and how much one takes advantage of the full range of the flexibility inherent to the DVC system as well as how one wants to factor in non Disney trips. It pays to be informed. I think for many, owning both has it's advantages if you can get on a large enough scale to justify both.