I always heard a broad one - and in Gaoth Dobhair the difference is clear since slender r is pronounced like a y
where did you hear a slender one?

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Mostly Rann na Feirste, but until reading your comment I would have associated it (perhaps wrongly!) with Gaoth Dobhair speakers too, despite the slender 'r' ('y') sound in other cases, dobhair (dowee), máthair (mathee) srl...

Am not an expert though, and it's possible I'm more influenced by reading rather than by the sounds themselves - in Donegal literature, it's nearly always spelt pioctúir, isn't it? Don't think I've ever seen pioctúr... although I'll try to look out a few examples to check that.

Also, for me, tugann (bheir) sé i mo chloigeann é seems more common to Donegal than cuireann sé i gcuimhne domh é, even if you hear both...

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Ultach mé agus Gaeilg Uladh a labhraim go measardha maith!

but people don't always write as they speak. And actually many don't know how they should spell what they really say. They may write "pioctúir" because they saw it on some books and pronounce "pioctar"...

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Yep, point taken. I was surprised by your spelling because I've always heard úir and because it's the way the great Donegal writers chose to spell it. That's all. It doesn't really matter, I suppose.

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Ultach mé agus Gaeilg Uladh a labhraim go measardha maith!

You heard /p'iktu:r'/ in Rann na Feirste?

Normally, -úr is /əɾ/ in Donegal, as in gasúr /gasəɾ/, in my experience. But maybe not everywhere...

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne