In Palo Alto, and some other parts of Silicon Valley (Cupertino, Sunnyvale, West San Jose, Willow Glen), Eichers and Eichler-style homes remain popular options. However people either love or hate them. It is possible to make them energy-efficient, which many people in PA have done-once the windows and roofs are changed, they can be very comfortable. There are groups of people passionate about Eichlers and their historical significance-and connecting with that group may increase your enjoyment of the home and neighborhood.
However, if you don't particularly care for Eichlers, choose a traditional ranch style home instead.
The answer is a subjective one. Homes have an intrinsic value that is hard to quantify. Some people love Eichlers and some absolutely hate it, In my opinion, in this case the value would be based on your preference. If you are cost conscious , I would place a higher value on a standard single story.
The cons of an Eichler are that they do not have an attic or crawl space, no insulation and large single pane non-tempered windows and glass panels. From an energy efficiency standpoint they rate very poorly. This of course can be modified, but is quite expensive. They have radiant heat which provides you with better indoor air quality, but with an aging system may need replacement. If you go for a standard system, it is hard to get the ductwork done, unless you place them on the roof like an industrial building. there are other alternatives that Eichler contractors have designed. Similar issues with electrical, where you have to go through the roof or have have exposed wires inside the home.
A traditional house also will have similar issues but will be easier to handle because of the attic space, crawl space and reasonably sized windows.
The come with their pros and cons. They are built on slab where other homes may be built on piers.