Chris,
MultINK is only as good as the graphics printed, transfer paper used and the curing method done. This is a general rule for heat transfer inks. ChromaBlast was designed to be one of the softest hands for a transfer, but it is a combination of the ink and transfer paper. If you put ChromaBlast or MultINK on a paper with a heavy hand (i.e. more Polymer), than they both will have great looking colors...but the window will be noticeable and the feel will be heavier.
MultINK does not have the clogging problems that ChromaBlast has and it provides great colors with the profiles in MultiRIP. The chemical makeup of MultINK allows it to minimize the color shift under the heat press. However, ChromaBlast (similar to dye sub inks) is the only heat transfer ink that I have seen that gets brighter after it is pressed.
Basically, both inks are good for heat transfers. The both have positives and negatives. However, MultINK is the better one when you want to use it for film positives because of the UV inhibitors.
Feel free to ask additional questions if you have them. Here is a link to video as well -
YouTube - MultiRIP Hybrid Printing Software - Digital Transfers & Film.
Mark