For the sake of argument, here are their month by month HR totals last year:
Upton: 12, 2, 1, 1, 8, 3
Bruce: 1, 7, 10, 4, 4, 4
Both had about 2:1 K:BB ratios post-ASB, with Bruce posting a gross .239 AVG, albeit increasing walks.
Bruce also hit 43 doubles to J-Up's 27.
3-year-splits suggest Bruce is not very good at baseball in September with a .228 avg.
Worth noting that without Choo in CIN, his counting stats are bound to dip a bit, and stat-heavy sites like Fangraphs are mixed on him --- some see the increasing K% and argue with IBBs he received his discipline is actually getting worse, but those same guys have no idea what to think of J-Up.
In my eyes, it's a wash, but I always tend to tip my cap towards power hitters, so I'd go Bruce.
12-team, 10x9 H2H; 20 MLB, 8 MiLB keepers
LF/CF/RF/OFx2: Trout/Yelich/Ozuna/A. Garcia/Martin
Bench: Kang, Miller, Souza
SP: Hamels, Greinke, Ryu, Shields, Samardzjia, A. Wood, Paxton, Shoemaker, Holland
Minors: Bryant (CHC), Swihart (BOS), Heaney (LAA), Norris (TOR), Conforto (NYM), Olson (OAK), Shipley (ARI), Tapia (COL), B. Zimmer (CLE)