An upgrade stand is usually a system-based design off the shelf that is either offered within the sponsorship package or as an option from the main contractor.
If your budget is tight and you only require a small space, it is best to run with shell scheme. It gives you a great base to build upon and limits your additional expenses in terms of the stand itself to furniture and graphics.
Stand Upgrades can provide value for money. Packages usually incorporate AV, furniture, flooring and graphics and are the next step up from shell. The value is usually in that the stock is off the shelf (not new) and it is not time consuming or difficult for the stand contractor to build