Question about Elliptical trainer

My husband and I purchased a trainer a few years ago.  We had to get a heavy duty one because of our weights.  The ma*****e gives me a calorie count each time I use it.  However, I started using My Daily Plate yesterday, and it gives me a drastically different calorie count.  DP says I burned 441 calories in a 20 minute workout.  The elliptical read 175 calories.   I know that Daily Plate takes my body weight into consideration, but I also remember setting up the trainer with my weight as well. 

Which do you think is more accurate?

They both sound a bit high.  It is closer to the 175 # and that would assume that you are really humping it for the 20 minutes. 

I think it depends on how fast you were going. what was your average speed and resistance?

Yesterday, I was on the manual setting, but I was going about 3mph, which is chugging it for me. 

Today, I put it on the fatburn program (resistance starts at 2, builds to 5 it stays there for about 15 minutes, then decreaases back to 2) and it registered only 100 calories burned in 25 minutes. 

I am totally confused now.  I do not believe the 400+ calories burned I am getting from DailyPlate, but to burn fewer calories with a program that has more resistance and a longer time?  I do not get it. 

I think I will just ignore the calories and go with how I feel and how long I work. 

Thanks guys!