I'm not sure if we can call any project "safe" but in the case of IEO or STO chances to be scammed are definitely lower than in standard ICOs.
for now, maybe IEO and STO are safer than ICO. but in some future time I think all of these processes will be the same. because scammers will come and find ways to still be able to get money.
for now there is no ICO project recommendation.
I agree with your opinion that IEO and STO are safer with the top exchange records, when ICO first started it was also fine but as time went on scammers began to emerge and develop so maybe some IEOs will someday end up like ICO,we don't expect that but scammers always look for other ways.