The amp is the stronger of the 2. A preamp is a better upgrade.
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The 3020 was used as a preamp primarily by those seeking more power and it had a decent phono stage. At ~$100 each for the contained amp and preamp sections, this unit represented the best sonic value/$ at the time. IMHO it is hard to say which section represented the better value in its own right.
A true upgrade would require replacement of both the amp/pre components. THere are many great sonic value/$ integrated amps available today.
If one was to use the 3020 as a bridge to a amp/pre based system, and 20 watts would suffice until one was ready to upgrade amp then one has the option to search for the best deal on either a new amp or pre that will facilitate upgrade. Zd's point is valid under this scenario, particularily if there is going to be some time before an amp would be purchased and an upgrade of the phono section is important..
If one was considering the purchase of new speakers, then the 3020 should be used as a pre and one should purchase a new amp keeping in mind the amp/speaker interaction.
All the above is stated as MHO, and therein is my position that 'it depends' :-).