CPAP Rental whats important when choosing supplier?

Hi Ive OSA 89 apneas per hour diagnosed Feb 23. I need to change suppliers as not happy with current set up so Im thinking in order of priority: customer backup, advice, good link to consultant, up to date machines, varied mask supply and cost are what I think are key to check out. Im particularly focusing on trying to figure out who has the best customer support as Ive become very ill over last 12 months with long term complex med conditions so this is important for me. Are all Irish suppliers in for a quick buck or does sound advice and support feature at all? Second query is am I forgetting something else important? Have to rent as buying is not an option atm. Would love to hear experiences or thought. Thanks 😊