I liked taking the champion with a doom siren and placing him in a basic squad in a rhino and did drive-bys.
As Killersquid said, it really depends on how you are kiting out the rest of the squad and also what your meta is like.
If you are going for sonic blasters and/or blast master and maintaining a support role or an objective camper, a cheap as chips champion works well. If you have the points, adding a power weapon is great to have for any challenges you'll likely encounter. The higher initiative really helps out there.