Some things to consider in making your decision include:
Future hard part upgrades - will you need to customize your tune if you add additional hard parts? The real question here is will a handheld tune get the maximum performance from your upgrades?
Do you need to acccess your TCM - EFILive will allow you to tune your TCM, handhelds only adjust ECM settings.
The need/want to tune other vehicles - with EFILive you can tune 2 vehicles straight out of the box, and purchase additional licenses to tune additional vehicles, whereas handhelds can only be used on one vehicle at a time.
Cheers
Cindy