Depends on how much you think you would use the lounge. We used it a lot on our cruises on the Fantasy...had breakfast in there, often had lunch and/or late afternoon snacks in there, popped in frequently for a cappuccino or to replenish our supply of soda or water, and took advantage of both free happy hours each day. We also love the social aspect of the lounge...getting to know the concierge hosts and bartender and the other passengers.
You should also consider if you would make use of the concierge sundeck, which the classic ships do not have. And obviously, as you mentioned, if you want to go to Remy, that pretty much makes the decision for you.
We did Alaska on the Wonder and it was great, but we definitely missed the Lounge. If you do wind up going on the Wonder, I particularly love the 1-bedroom suites with the alternate layouts and the triple-wide verandahs (8032, 8034, 8532, 8534).