Ardor will be the main chain and ignis (NXT 2.0) will be the first child chain of Ardor. If you have NXT you can participate still in the ignis ICO which will give you a discount on buying JLDRA token. 1 JLDRA = 1 Ignis. If you can't participate in the ICO than every NXT will convert into IGNIS in a ratio of 1 NXT = 0,5 Ignis. So to recap everything Ardor will be superior as it's part of the main chain and Ignis (NXT 2.0) will follow. I personally thing Ignis will be good for short term profit and ardor for long term profit.
Read and learn:
https://nxtplatform.org/ignis-ico/Looks like quite a complicated item to look at,,, you have Ardor, and then a child chain NXT, and then with that you can get Ignis for JLDRA token? Why would you make so many layers? Anyway, look at crypto markets now. Such a huge gap from two weeks ago, not sure if further ICOs are going to be a wise move. I have to be patient and wait for this to pass.