Try.inogen

Some of my thoughts as a supplemental oxygen user that hates to drag a heavy tank around.

AS ALWAYS, ASK YOUR PHYSICIAN OR PULMONOLOGIST FOR ADVICE & Rx if needed.

1- Know your supplemental oxygen requirements (L/min) at rest & under exertion.
2- most at home units are 5 L/min maximum. Need more? Then tanks are what you need.
3- Portable units are 'pulse flow' & specify battery time, usually stated as "As long as x number of hours"
But 1 L/min May be the 9 hours listed, if you need 3 or 4 or more that number decreases at an alarming rate. 4 L/min largest batteries may only be 3 or less hours. So again, KNOW YOUR REQUIREMENTS & USAGE.
4- So ask the supplier for battery usage per hour for your oxygen needs. IF they will even tell you.

5- Home units provide continuous oxygen flow. Again if you need more than 5 L/min, Tanks will be the way to go.
6- Home units usually are heavy. 18 to 30+ pounds. And can be very noisy!
7- To my knowledge most home units DO NOT HAVE REMOTE controls.
In this day and age of electronics that IMO is absolutely necessary.
Who wants to get up & go to where the heavy units is located to change oxygen setting?

In summary,
KNOW WHAT YOU NEED
ASK SPECIFIC QUESTIONS
KNOW WHAT YOU WANT TO SPEND

I tend to avoid DME's(durable medical equipment providers)as they will continue to charge a high monthly payment even way beyond the cost of portable & home supplemental oxygen equipment. But that my May be the way to go from a maintenance standpoint.