Need help to decide between Arizona Mattress and My Green Mattress

We have been researching chemical free mattresses. My Green Mattress seems less expensive but their quote so far is on diffferent mattress specs:

ARIZONA MATTRESS: $5,129
PURE LATES BLISS BEAUTIFUL SPECS :
12" TWIN XL DUNLOP LATEX Beautiful 12" $1,365.00
12" TWIN XL DUNLOP LATEX Beautiful 12" $1,365.00
SHIPPING $130.00
Ergo/Softide #5100 series adjustable bed in TwinXL is $995 $1,990.00
SHIPPING White Glove Delivery and setup $279.00

MY GREEN MATTRESS:: $3278
:10" NATURAL DUNLOP LATEX
TWIN XL $1,039.00
TWIN XL $1,039.00
BED WARRANTY 10 YEARS
RETURNS YES: 100 NIGHT COMFORT
WIRELESS TS-200 ADJUSTIBLE BED $1,200.00

What is the difference between the adjustible beds:
Ergo/Softide #5100 series adjustable bed: or Transitional Sleep System TS-200?
What are the foundation frame materials? Wood or metal?

Need your opinion and advice please…