power of preset instruments

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to make "good" sounds, do i need to install a bunch of VSTs?
or are the preset instruments like LB 303, 3xOSC powerful enough?
also i found that when i have a bunch of Synth1's, LMMS tends to crash easily.
will the same thing happen with zynaddsubfx, since it also utilizes GUI?

thanks :)
Absolutely not, you don't need VSTs to make "good" sounds.

Triple osc, Zyn, etc. are more than powerful enough to create almost any sound imaginable. Especially when combined with a bunch of effects that LMMS offers.
nothing against samples, but I never use them and I never will. why? why should I? I have found everything I want. Plus, listeners don't have to download to hear it.