I use Tennax on white styrene, such as vacs. I like the way CA works better on injected parts.
I haven't heard of CA crystalizing before. I know some guys that have 15 year old R/C planes assembled with CA. I also know that there are many types of CA some work real well with splastic and others are a disaster.
I use PlastiZap and Krazy Glue (small plaxtic container in a plastic tube). OTOH, Krazy Glue makes a larger 1/4 oz bottle with a cool cap. This stuff is marked Kraft and it's worthless for modeling.
I have never found a putty or other filler that feathers into styrene as well as CA does. I converted a Lindberg Jenny to an N9-H. The "chin" of the N9 was more upswept than the Jenny. I filled the inside of the fuselage front with CA. I built this up this layer by layer,to avoid heat buildup until I had quite a plug of CA in the nose. Then I sanded the outside to the new contour. The front end was clear CA feathering into gray styrene 1/4 to 1/2 an inch back. Impossible to tell where the CA stops and the styrene begins after 1 coat of primer.
In lieu of going on about the virtues of CA, I'll just say that I find way more advantages to using CA than disadvantages.
Who has not yet had CA crystalize on him.