Strikers or Forward this is the point there's no definition but football have evolved we now have wide forward, centre forwards and number 10's some players can play across all those positions (Messi, Neymar, Ronaldo) but Lukaku is very much a centre forward so really it's only fair to compare him with similar players like Benzema, Saurez or Lewendowski who aren't going to play wide they always play up the middle.
This is where you get the problem can you judge a player individually in a team sport? This is a team sport so judging a player by what he's won is harsh because if he doesn't have a good team around him he won't win.
Maradona didn't win the world cup on his own nor did he win the league with Napoli on his own this is legend that has grown over time obvious he made a massive individual contribution to winning these titles but teams win titles not individuals especially in a sport like football where it's 11 vs 11.
For me if you're judging a striker or centre forward which is what Lukaku is every goal he scored for West Brom is worth double what he scored for Utd because unless you're in a top team you aren't getting lots of chances. A better judge of a striker is his conversion rate and Lukaku's is very high now this is probably because he doesn't take on to many difficult chances but he's very clinical in the box.
Higuain is an interesting one
@IDFD this is a guy who's regularly frozen in big games for club and country but he is relentless when it comes to scoring vs weaker sides.
There's also an element of these guys being the next generation to step up Lukaku, Morata, Bellotti & Kane are the 20-25 year olds who need to take over as the elite level guys now most of the recognised big names are hitting 30 and will start to decline. You then have the next generation like Jesus, Mbappe & Rashford coming behind them.