I split my batches every time I brew. I brewed 16 gallons of Saison 3 weeks ago. I used 3 different yeasts. I just pulled gravity samples for the first time and I have 3 amazingly different Saison beers. What I like is the opportunity to try so many different yeasts. I think the split batches for you is a great idea. I've been using yeasts from other suppliers too, other than WL and WY. If I didn't have so many people drinking my beer, I would go to smaller batches for sure.
I really want to branch out with yeast. Right now I mainly use dry yeast so the opportunity to use more liquid yeast without needing to make a starter is very appealing. I have not done any direct comparisons so it would be cool for me to do basic things like comparing a lager yeast to US05 or something. That will really help me dial in my recipes because right now I just kind of have default yeasts that I use because they are convenient. When I visited White Labs a few months ago it was pretty interesting to taste the same beer with 4 different yeasts.