On thing close to my heart is suitable seating that prevents stresses in spine, neck and hips it can transmit to head and give headaches
When purchasing a seat, modern seating is very low this is counter productive, to low, when sitting to difficult to get out.or sit down.
This causes the body to low squat in turn it puts pressure on the lower spine and hips, when we rise it puts pressure on hips, spine middle lower back shoulders the list goes on, when these problems the user can even have headaches from the spinal cord.
Now the body cannot relax stresses are always there.
When purchasing a new seat look for a high back, the seat should enable the feet sit firmly on the floor, the knees should be straight, and knees should sit to hug the nose of the cushion. Posture in the seat is important to me the back should be straight and neck and shoulders supported by the back of the seat,armrests should be at the hight of your elbow, your arm should be straight.
The best chair should be firm with a cushion that gives support.
When buying a seat check the cushion depth and and length, check the the height of the cushion, Good furniture shops should be able to have these mesurements a good selection should be available.One company I know has this type of furniture.
If you want a recliner the same applies the legs should be straight out back straight or reclined with good support power riser recliner are good this takes stress of spine and legs when rising all of above applies here.also
Riser recliners are expensive, although a company I use sells of dem models or returns, at good discount prices, Vat is refunded for these. typres of seat.
When choosing try for above, sit for say 15 mins in quiet feel the seat, move around in it. stand sit, make sure there is good support, do not be rushed. remember this seat will be with you for about 10-15 years, they are an investment in health, YOURS.
All the best