Need to compare Business Objects to tableau (specifically in regard to Tableau Prep)

I looked at two older SAP Community questions comparing B.O. to Tableau (here and here), but I’d like a fresh (quick) comparison.

I’ve used Business Objects for 7 years and really like it. It’s a workhorse, and I’m sure if my Dept got some motivation we could do snazzy-enough Dashboards (good enough for government work).

Business Objects for us is great, we just connect to the Oracle transaction system and it’s good to go. We don’t have big data so it’s fine, our work is mostly for operational reporting. We also have a Data Warehouse but it’s essentially a transactional d.b., not really a true data warehouse (summarized etc.).

Previously I envisioned Tableau and Business Objects to be similar tools, but the two older questions above beg to differ, as Tableau has always been the ‘data visualization’ tool.

Then I come to find out that there is such a thing as “[Tableau Prep]” which looks like an ETL tool … If so, this would not work for us because the ETL component is a ton of overhead, which we don’t have at all in our Oracle environment - we just connect Business Objects to Oracle and start building Universes and such. 

So I’m trying to avoid a big “uh-oh - we got a lotta work to do” if we jump into Tableau.

*Tableau has come into the mix as we have a license to it via Salesforce, but we’ve also implemented Google Big Query and so that is going to be our database to pull from. And you can do some data visualization there.

**I would prefer we just use Business Objects, but it’s on the way out along with Oracle (in 5-6 years)