The difference between the DLX and the plus, is that the plus can take a toddler seat at the bottom. The handle on the strider isn't telescopic but it can be moved up or down, similar to a mountain buggy handle (iykwim!). There is a slight difference in the basket size, but other than that, I don't think there is much different.

Good luck - I found pram shopping the hardest decision to make (oh and we have the blue strider and it is pretty lol!)