Both sizes have their pros and cons.
Trex deck framing spacing.
So when would you ever need to use 12 inches oc.
Most composite and pvc decking brands like trex and azek recommend a minimum joist spacing of 16 inches oc.
Trex signature railing and rod rail are made to be installed at maximum 6 or 8 clear span between posts.
Timbertech pro and timbertech edge boards must be a minimum of 1 8 to a maximum of 3 16 deck board spacing.
The eighth inch spacing provides for a safer surface for walking.
When designing a new trex or composite deck the spacing between floor joists should be 12 inches on center.
Most deck joists are centered 16 inches apart which is the maximum deck joist spacing for most low maintenance decking.
If adding additional framing be sure to keep all boards level and in plane across the tops.
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Trex transcend and select horizontal railings are made to be installed at maximum of 6 1 83 m or 8 2 44 m on center depending upon type of railing you choose.
Many jurisdictions following the international building code which requires a minimum 1 8 inch spacing between boards.
Those railings are not true 6 72 or 8 96 in length.
You also may have to install more stair stringers.
For timbertech azek decking it s recommended to have a minimum 1 8 to 1 4 side to side gap between deck boards.
Most composite decking materials like trex composite decking require minimum joist spacing for composite decking at 16 on center spacing for straight decking and 12 on center joist spacing for 45 degree angle diagonal decking.
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Some brands like weardeck let you get away with more reinforced with a layer of fiberglass on both the top and bottom weardeck boards easily allow for spans of 24 inches oc.
Generally an acceptable gap between deck boards is between 1 8 inch and 1 4 inch.
For a more rigid feel 12 or less may be preferred.