Hi,

the ASW19 will probably give you least concern in terms of maintenance. At least here in Europe, Schleicher provides excellent support even for the older ships. There is no type certificate holder for the PIK20 anymore. Parts for LS1-f are to some extend still available but you may have to pay the "DG-tax". For previous LS1 versions, things are more difficult.

Assembly of all three models works pretty similar, but the ASW19 has rather heavy wings (70-75kg). All have manual aileron/flaps connectors. Most 19 have a manual elevator connector which one needs to take care of.

Best,
Christoph