Cloud-based Accounting/Bookkeeping or "Conventional"?

Hello Everyone,

I have a deal I'm working on (post-LOI and financial diligence, in documentation), and as the process gets into the later stages, I'm starting to think about day one issues and beyond. One of those things, of course, is bookkeeping/accounting. I've seen a wide, wide range of pricing from CPAs when it comes to bookkeeping services. It seems that on the lower end, the accounting firm provides a cloud-based solution that I think is largely QuickBooks Online with some level of support for a few hundred dollars a month, while other firms provide a more "traditional" approach, that seems to cost literally 10x more. How should I go about making a decision between the two, given the gulf in pricing? Is it that hard to do the bulk of the work oneself in QuickBooks (without sinking so much time as to make it counterproductive)? Some potentially pertinent details:

1) Roughly $1.5mm in revenue

2) Checking account shows something like 800 transactions last year

3) The company currently uses a bookkeeper and a separate accountant; the bookkeeper is retiring and doesn't want to continue on long-term

4) This is my first rodeo; my background is in (large-company) finance

5) The company designs, markets, and sells fitness equipment; most sales are made online, and the product is manufactured abroad

6) Only about 3 other employees, and there doesn't seem to be anyone on staff that could handle the work out of the gate

Thanks!