Currently $ERGO is a growing project,
ranked #310 in CMC and getting enough attention from the crypto public. But, when compared to Bitcoin, of course it won't make much sense especially if you expect $ERGO to become successor of Bitcoin.
Currently it has a $70m market cap........... Should I sell part of my BTC BTC for ERG?
My advice is don't sell your Bitcoins for $ERGO, because soon we'll be in a halving (hopefully the first quarter of next year) which will (probably) have a significant impact on the price of Bitcoin itself.
i am more on the side of selling ERG (if you have any) to buy BTC. just look at the current ranking of this alt and you know that it won't even come near with
BTC. but it is your prerogative to invest on this market, you have short-term and long-term plans. so it depends on your strategy here. some can possibly earn profit from ERG on a short-term basis. in this regard, there's no concrete path that you can take, but the profitability depends on your next steps, how you will handle such assets.