I own Bitwig and it's awesome in many ways. I have used Ableton for 10 years, and Bitwig accomplished almost the same solid features at 1.0. There are just a few things that keep me on Ableton:
1) Ableton Push...I can't express how much this makes things easy, especially drum rolls and automation. I would still use Bitwig, but...
2)They still have not implemented the 'smart clip' feature, where I record a clip, and Ableton already knows to cut to the nearest bar. So, every clip in Bitwig has to be preset length, or you will always have to edit after recording. That is very distracting to the creative process.
As for modulation using LFOs, Bitwig smokes Ableton. Every parameter I can think of is very easily modulated in Bitwig with extensive options. In Ableton, you must have Max4Live, and you'll need an instance for every modulation you want. Ableton's LFO is not very CPU efficient, so using 10 will be noticeable. If you never used an Ableton Push, or experienced the smart clip feature, you may be able to overlook that an have a lot of fun in Bitwig. Try their demo!