Glenfiddich is not particularly good but is acceptable in an emergency.
Glenmorangie is slightly better but is what I class as a fall back whisky.
If you really like malt whisky, try something like 15yo Balvenie or 15yo Glenlivet - they are two widely available and not too expensive malts and are both very nice (the Balvenie is especially nice).
Morrisons actually do a range of cheapo malts, I tried the Islay version recently and quite liked it - they are pretty cheap and if the others are to the standard that the Islay was, they're good VFM.
If you've got a little money to burn, try an 18yo Glenlivet or a 21yo Balvenie - this has been finished in a port wood cask and is divine. Pretty reasonable price at about £45 a bottle too.
Mmmmmmmmmmm, Whisky
Stan