Microsoft office for mac vs windows microsoft office using vmware?

Planning on installing vmware fusion on my new macbook air to allow remote access to small business server. Use excel and word extensively at work. Wondering whether I should install microsoft office for mac or whether I should install native microsoft office for windows on the virtual machine.

Things to consider:

1. Never used vmware fusion before

2. I'm assuming that by running native microsoft office on vmware fusion it will reduce any slight "glitches" that may occur when switching between office for mac and office for windows (I've used office for Mac extensively for the last 5 years and not had major issues but there are occasional small "glitches")

3. Won't be accessing the small business server every day/night however I will be using microsoft word and excel every day/night from my macbook air

4. Don't have a copy of either microsoft office for mac or microsoft office for windows so will have to purchase whichever I choose

Would love your feedback.

Thanks

Mick