Hi Lisa, difficult one as it is down to personal preference.
An upright vacuum, i.e Sebo is good for End of Tenancy and your move ins, as they have brushes and pick up a lot of soiling.
However, they are a tad more expensive, my supplier selling for £200.
Or
The little babies.....Henry etc etc.....
We have used the NVH.200's since 18 months ago on building sites etc, and they are still going.
For the showflats etc, we have either the uprights above, or the new Dimplex DV9's which look very smart at around £72.00 each
Know doubt you will be able to hear other peopls preferences on the postings below, then you will be able to decide for yourself.
Happy hunting
Kind Regards
Tim