Trademark law firms handle all matters that deal with trademarks. It is their responsibility to counsel the client about their particular trademark. He should do the proper research and determine if your trademark is safe once you submit an application.
Corporate lawyers are there to handle all legal issues for one corporation. Depending on the size of the business, a corporation can have a whole legal team working within the company or just one person handling all legal matters. Usually anything that has to do with contracts, mergers, acquisitions or product liability will be handled by corporate law firms.
If the matter is to proceed to trial, the law firm will build a defence around the client's instructions, and organise for the attendance of witnesses, and obtain second opinions from expert witnesses if necessary. active