[Python] How best to insert a separator between list elements (but not at the beginning or...

I'm a beginner, practicing Python, I want to understand if one or the other way is better version. If yes, please elaborate! And how to determine the same in future, on my own?

words = ['This', 'is', 'a', 'list']
separator = ' - '

for word in words:
if words.index(word) < len(words) - 1:
print(word+separator, end='')
else:
print(word,end='')
print()


OR

words = ['This', 'is', 'a', 'list']

for word in words:
if words.index(word) < len(words) - 1:
print(word, end=' - ')
else:
print(word, end=' ')
print()

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