Its a personal choice/preference...
1st Q: What are you trying to get from running an OTR over what you have now?
2nd Q: MAF or MAF'less OTR?
This will make your choice even harder as MAF'less = You
must get the vehicle tunned, so add $500-1000.
3rd Q: How much $$$ you want to spend?
Personally I like stock look for pre VE models, so MAF'less=DUS get's my vote, but cannot justify the $$$ when you should retune to get the most out of it.
With MAF= The older orssom model get's my tick.. and can be cut to go MAF'less in the future.
NOTE: 2nd gen VCN only fits
VE/VF... I also think it's MAF'less ONLY and again cannot justify the $$$ when you should get it tuned as well.
(Disclaimer: I am no mechanic and the above info is given freely, it's your choice in the end...)