Asus z370-f vs Gigabyte gaming 5

Specs-for-specs, the Gigabyte Gaming 5 has more features (not necessarily better - as this depends upon your wants and needs) than the Asus Z370-F, though, the Asus also has a couple perks that the Gaming 5 doesn't have:

VRM Phases
Both have a true 4-phase rail that are doubled to 8 phases for the VCore. Gigabyte has 3 rails for the VCCGT (for the integrated graphics) while Asus has 2 (not that it matters if you are to use a dedicated GPU).

MOSFETs and Capacitors
Gigabyte uses ON Semi 4C10N+4C06N while Asus uses Vishay SiRA14DP+SiRA12DP (slightly better). However, Gigabyte uses 10K Black capacitors though vs the Taiwanese 5K capacitors of Asus.

Diagnostics / Debugging
Gigabyte features a 2-digit display code LED and an assortment of on-board LEDs for debugging CPU, DRAM, VGA, and BOOT issues. Asus only has the on-board LEDs (no 2-digit display code LED).

BIOS
Gigabyte has two BIOS chips (DualBIOS), while Asus only has one.

I/O and Audio Armor
Both have I/O shrouds, but Gigabyte extends it down to act as an Audio armor/cover while Asus is limited to the I/O above.

M.2 Slots (Quantity, Bandwidth Sharing, and Heatsink/Armor)
Gigabyte has 3x M.2 slots vs only 2x in Asus. However, the 3rd M.2 slot of Gigabyte shares bandwidth with 1 of the 3 PCIe x16 slots, making it run in x2 speeds (thereby eliminating the possibility of a 3-way CrossFire, if you are into multi-GPU). The Asus, only has 2x M.2 slots, but in no way affects any of the 3 PCIe slots. Moreover, the Asus has heatsink covers on both of its M.2 slots, while the Gigabyte has none.

PCIe x1 Slots (Quantity, Bandwidth Sharing, and Layout)
Gigabyte has 3x PCIe x1 slots vs 4x in Asus. The Asus does have 4x, but, 1 is right beneath the top PCIe x16 slot used typically for single-GPU setups (in which case, you can't physically use the slot as the usual 2-slot thick of the GPU will overlap it). However, all PCIe x1 slots of the Asus does not share bandwidth with any other connectors (you can technically use all of it at the same time). In the Gigabyte's case, 1 of its 3 PCIe x1 slot will disable a SATA port.

RAM Slots (Reinforcement)
Both have 4x DIMM slots, but, the Gigabyte is reinforced while the Asus is not.

Wireless LAN
The Gigabyte has an M.2 Key-E slot and a pre-installed wireless module (although only using Intel 3165, which is 1T1R streaming up to 433Mbps). The Asus does not have a wireless module, nor an M.2 Key-E slot. You can, however, install a PCIe x1 wireless expansion card on the Asus (separate cost) if you wish to have Wi-Fi.

Audio Codec
Both have technically the same OEM (Realtek) using the ALC1220 codec, but, Gigabyte uses the default codec and Asus has an "enhanced" codec repackaged as SupremeFX S1220A.

USB Ports and PS/2 Port at Rear Panel
Both have 1x USB3.1 Type-C, 1x USB3.1 Type-A, and 2x USB2.0 rear panel ports. However, Gigabyte has 4x USB3.0 vs 2x USB3.0 in Asus (for a grand total of 8x in Gigabyte vs 6x in Asus). If for some reason you are still using a PS/2 port, the Gigabyte has it, while the Asus does not.

USB Headers
Both have 2x USB2.0 (9-pin) headers. But Gigabyte only has 1x USB3.0 (19-pin) vs 2x USB3.0 (19-pin) in Asus. However, Gigabyte does have a USB3.1 (20-pin) Type-C connector but only runs in USB3.0 speeds. Note that the Asus feature 1x USB3.0 port oriented 90-degree, i.e., parallel to the mobo (which would help in cable management for that thick connector).

Fan Headers
There are 8x total fan headers in Gigabyte vs only 6x fan headers in Asus.

RGB LED Strip Headers
Gigabyte has 2x 5-pin +12V headers (12V/G/R/B/W pinout) and 2x addressable 3-pin +5V/+12V headers (V/D/G pinout). Asus has 2x 4-pin +12V headers (12V/G/R/B pinout) and 1x addressable 4-1pin +5V header (5V/D/-/G pinout).

LED Lighting
Both have Sync support. But Gigabyte has all the bells and whistles in terms of the quantity of illuminated portions in the mobo compared to Asus, which is much simpler.

If you want more information on this two motherboards and other motherboards you wish to consider, you can check the comparison tables of all Z370 mobos in the link inside this thread here: http://www.tomshardware.com/forum/id-3546694/z370-motherboards-lga1151v2-comparison-tables.html