Which window is a better buy , horizontal slider or casement ?

I am in the process of buying windows.

UPVC, Wood, or aluminum ?

Answers:
"Horizontal slider" is a single hung or double hung window. Single hung windows have the bottom sash as operable only. Double hung units have both sashes as operable.
Casement window open out. This can be a problem since they open to the weather.
Casement windows provide the most screen area when open but can be impracticle if security is an issue.
Pre-finished Vinyl coated wood are the best types but may be impracticle if the purchase is for replacement windows. You would need to check with variuos manufacturers to see if they provide a replacement type unit.

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