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For most triathletes fitness rather than bike handling skills is the biggest limiter. When you are very fit from training on a turbo get some rollers. It is easy to go flat out on a turbo not so easy on rollers.
If you want to improve bike handling skills then ride outside, MTBs are great fun in the winter.
In my opinion anyway - which is often wrong (ask the wife)
I have some rollers in the garage. Not used them for over a year. They can be very tricky to get used to. Prefer the turbo as I can't fall off it.
Triatheletes don't like bike handling skills. That's what separates us from mere bikers.
Crazy Diamond wrote (see)
Rollers look scary as tacks on a corner - I'd definitely break several bones before my neck!
The myth is much worse than the reality. The problem is when you approach them too cautiously your front wheel will be all over the place. Get the power down then everything becomes much more stable and it is quite easy. The concentration required does make it much less boring than the turbo.
A friend of mine got some rollers for Chrimbo. She's a GB Age Grouper at Olympic distance, and top-10 in the Euros and Worlds in her age group, so no mug, despite clearly lacking the aerobic capacity to complete a proper triathlon.
She looked like a frightened rabbit on her rollers, wobbling all over. I'll stick with my turbo.