Which type is most suitable?

	A-Boards	Swinging Signs	Wall Boards & Poster Frames	Verge Side Notices
Permanent message	√	√	√
Changeable posters	√		√
Folding	√	√
Wind resistant to 70mph		√	√	√
Locking poster frame	√			√
Verge side notices that are easily changeable				√
Instant messages with blackboard chalk pens	√		√