Before jumping in and declaring that one type is better than another...
How are your eyes?
You said you wear glasses... bifocals???
Near sighted or farsighted???
"Blind as a bat" or just need glasses "for reading"???
I'm blind as a bat.
I've had the usual swapmeet collection over the years,
tossed most of them away... you learn what works for you as things go on...
I now have 2 focusers, a top of the line Peak, and a battered old Magnasight. (The kind shown below, the kind tkamiya mentions)
The Magnasight gets used 95+% of the time.
It's just plain faster and easier to use for low to medium magnification (say, 6-8x), especially if sharp edges (windows, wires, etc) are visible in the image. The big aperture is much easier to view from a reasonable distance, even with glasses.
Sometimes the image doesn't have crisp lines to focus the ground glass of the Magnasight on, so the Peak is better... but squinting thru the eyepiece means putting my face down to the easel while reaching up to adjust the enlarger focus. With really big prints this is a bit awkward...
Find a Magnasight on Craigs List and your search may be over...
Reinhold
www.classicBWphoto.com