East Coast (Caithness) has whopping big fish as they are limestone lochs. The scenery is at best bland and agricultural.
Personally I would prefer chasing smaller fish in the mountains north of Ullapool above anywhere else in the UK. Drifting on a boat with Canisp, Suilven, Stac Polly looming overhead
Scionascaig (sp?) and Cam loch are about 30 mins north of Ullapool and great from the boat. A massive network of lochan after lochan in the hills and best tackled with a map compass and tent (and float tube)....don't forget the Avon Skin So Soft and the cigars to keep off the midgies
I recently had a lovely day on Drumbeg loch , North of Lochinver (great gastro pub in Lochinver). Cracking medium sized boat water.
Spoilt for choice literally hundreds of lochs within an hours drive