the safest is to invest in bitcoin. This coin is a leader in market movements. especially for now, of course a safe and profitable investment sought by investors. Ethereum, is also the second best coin after bitcoin, but lately the development is less in tune with bitcoin, and no one knows the cause, maybe next year's event can raise the price and attract the attention of investors again
The development as kind of been very slow just like you mentioned, and I think it would be as a result of bitcoin dominating, although I expected more form Ethereum because I dot expect what will affect other coins to also affect Ethereum being the second best coin, but here we are, the general market condition is still affecting them also, but I know that within a little short time more, Ethereum and some other top coins will bounce back to their last all-time high.
We just need to have bitcoin stabilize, once bitcoin stabilize, Ethereum will surely gain its own, momentum and then pull other altcoins along. I think Ethereum also with these their release of 2.0 next year has lots of features that will ensure that Ethereum continues to have proper development.