9 is a lot in my book! Before Fatso, I only had a fully engineered K2 and a long range hauling Conda with no need to engineer weapons/defences and a explorer/material Asp X again with no need for weapons/defences.
I do sometimes find it easy to forget where they all are

At least one of them is kept for sentimental reasons, it being my starter Sidewinder, and more or less moth-balled.
Each of the others have a specific purpose, though, and have been built accordingly. I’m not sure about a need for any others at this point, other than maybe building an Orca rescue ship. Or possibly a Challenger, just for the experience
Sidewinder “Cinquanta”: Honourable discharge, museum and leisure flights only
Adder “Runabout”: Engineered for max jump range, decent thrusters. Cheap to summon anywhere in the bubble, and acts as my ship transfer taxi.
Viper Mk.III “Bodkin”: Enhanced thrusters, G5’d, Drag Drives. Stripped down. Goes like the clappers. Great for hooning around and generally enjoying flying.
Viper Mk.IV “Gwynt-y-Ddraig”: My initial combat ship. Very tooled up, highly manoeuvrable, and still one I go back to for some RES entertainment.
Cobra Mk.III “Daffodil”: Heavily armoured, yet fast, equipped for “naughty“ missions, with SRV, collector limpets, recon limpets, and so on. Great for getting in and out fast, and has rail guns to take out ground defences before they know what is happening
Python “Lumberjack”: Armed trader. I almost feel it’s OP, it has beautiful hard point convergence, can shift handily with engineering, carries 180t, and can happily take out pirates that try it on. Used for BGS work a lot.
Krait Mk.II “La Piuma al Vento”: Multi-role ship, I have a rake of modules at it’s home base that can turn it from an armed miner into a battlewagon, and also into a trader if needed. It’s a joy to fly this one!
FDL “Splinter”: CZ and assasin craft. For when you absolutely, positively have to...
Imperial Clipper “Dôl-y-Gwair”: Explorer. For when exploring in style, with great screen shot potential is in order. It’s nice to see the look on the peasant’s faces when I arrive at some far-flung asteroid base in it
Asp Explorer “Hecla”: The finest exploration ship in the ‘verse. Long range, long jumping, and engineered to the max, this one kept me safe in the black for 18 months. Gets used for long range trips where “poking about” at the edges with some tricky boosted jumps are required.