Network infrastructure review - how to differentiate between network consultants?

Not sure this is the most appropriate forum to discuss as its not a Cisco product technical question per se but thought i'd give it a go anyway in case others have been through similar and can give some input.
Following recent mergers, acquisitions etc my company would like carry out a network review to find a recommended overall architecture/strategy moving forward. We have engaged with a number of different consultancies keen to assist us with this.
The problem is - what should we be asking/checking to help differentiate between these consultancies and select the best one for the job? They all "talk a good game" and can boast of CCIE accreditations in their teams etc - so what should we be doing to make sure we select the right people? (Cheapest does not always mean best!)
One thing we are keen on is that we only want them to carry out a review and give us recommendations - its not a mandate for them to actually sell us specific products and services following the review.
Any thoughts on this from forum members?

Thanks for the response.
It’s not so much finding a Cisco partner that’s the problem, it’s differentiating between them. If we talk to two different Cisco partners, then each can boast of CCIE engineers and give references from satisfied customers etc. Each will also have different timescales and pricing associated with them – is there any way we can differentiate between them to ascertain which one would be best for the job at hand or – if they have the same level of accreditation etc – should we simply go with the cheapest/quickest?

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