Those hops are all quite different.
Fuggles is a classic English hop that imparts woody / earthy notes however some perceive it as mouldy / dirt
Hallertau is a noble German hop, which is spicy, floral and even hay like (I don't get hay from it)
Galaxy and Citra are the most alike. Citra being more of a citrus bomb, and galaxy being more of a grapefruit / citrus fruit / stone fruit explosion.
They should also be used differently, with some being more for bittering, and some only for aroma or flavour.
Galaxy for instance shouldn't be boiled, and only steeped or "whirlpooled" and if boiled, at most 10 minutes.
Citra can be used both as a bittering (boiled) and steeped/ whirlpooled.
Both citra and galaxy are great dry hopped (added to the fermenting beer)
The fuggles and hallertau can be dual purpose, but probably not ideal for dry hopping, and the styles they go into generally aren't dry hopped.
Also, I get a similar smell on hops, they don't really smell (or taste) like what they will in the final product. Once they have been boiled, steeped or dry hopped their oils change (through isomerization or bio transformation and other things) which brings out the flavours and aromas as they are described.
In essence, raw hops don't smell or taste like their descriptions. That's a description of their final form in the finished beer.
The most important thing with fresh hops (or pellets) is to make sure they don't look off, strange colours and importantly don't smell "cheesy". I get a parmesan cheese type smell from bad hops, which does come through in the beer.
In short, SMaSH (Single Malt and Single Hop) beers are great at trying out their nuances, but some hops don't do well in a smash style beer. Noble German, English and some others are more reserved for their styles. Lagers, porters, stouts, dark ales etc.
If you want to read up on all the hops, brulosophy do a "hop chronicals" series which is an interesting read.