I like using all of the above, but I don't normally have access to a studio.

To learn the art of using natural light - metering and setting the correct white balance - is fundamental in using lighting for portraits.

I will use different lighting methods base on what I want the final outcome to look.

Easily controlable.

At present that is all I really need, but would like to purchase lighting for inside photos such as weddings.

Because, you can control the lighting... although, natural is very good too. But, do you get them there early in the morning or late afternoon? Easier said than done...With studio, it doesnt matter if its 2:00am or 12:00pm in the noon sun. You control the shadows and back lighting. But, it really depends on what I or they want for a final portrait, and when you can get them to your location.

White lightening.

Nikon SB-800.

I prefer ambient light because it looks more natural. If needed I use lighting that is on all the time.

For portraits I prefer Natural light on an overcast day, or a soft ambient light with very little direct lighting. I find it produces an excellent overall tonal quality and reduces the appearance of minor blemishes, wrinkles, etc.

I like the use of ambient light because it can offer different effects every time I go to my favorit places to shoot