Both sets you will be able to do the rim strip / tubless conversions
DT 5.1 / Hopes will be lighter
EQ31 / DT340 will probably be stronger - but a dt 5.1/hope wheelset put together by a good wheelbuilder can also be plenty strong
The DT are a softer rim, so will probably get dinged up easier - especially if it is being used for DH racing.
For pure DH between these two I would probably go for the Suns.
DT 5.1 / Hopes will be lighter
EQ31 / DT340 will probably be stronger - but a dt 5.1/hope wheelset put together by a good wheelbuilder can also be plenty strong
The DT are a softer rim, so will probably get dinged up easier - especially if it is being used for DH racing.
For pure DH between these two I would probably go for the Suns.