The nation has both, but does anyone know what is most common, or do
all channels use both modes?

It's very probable that in some areas they have PAL and in some others
SECAM, like in japan, where half the country has 50 Hz and the other half 60
Hz.

....but it probably doesn't matter - do everything in PAL and it will
work on modern European gear.

LCD Pixels
DVD-R and DVD+R - Can someone explain?
digital-8 recommendations for replacement for Sony DCR-TRV 230
Where to find used camcorders?
HD newbie question.. yes, I'm dumb...
Using S-VHS cable for RGB
Hooking Up
Inexpensive color bar generator
Rack EARS 4 ADC PPI1232RS-MVJT-bk Panel (Make shift)
Closed-Captioning on DVDs...