Alienware 17 or Alienware 18: Which Should You Choose?

Question

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Hello! I was faced with the question of buying a new laptop to replace the old one. Decided specifically on the brand and model. I will order from the states. This will be a laptop from the Alienware 17 or 18 line. The only thing - the question arises of the appropriateness of a laptop. It is taken as an alternative to the desktop. There are very rare outings with him somewhere (for example, occasionally to visit a friend), or no more than once a year to the university (for example, to a presentation, although this is not critical, in extreme cases I can borrow a laptop from someone)) .
So the specs are:
Alienware 17 :
Pebble: Factory Overclocked 4th Generation Intel® Core™ i7-4900MQ (8MB Cache, up to 4.0GHz )
RAM: 16GB DDR3L at 1600MHz
Graphics Card: NVIDIA® GeForce® GTX 780M with 4GB GDDR5
Display: 17.3 inch FHD WLED Anti-Glare (1920X1080) (Not 3D)
HDD: 750GB 7200RPM SATA HDD + 64GB SSD Caching
Drive: Slot-Loading Dual Layer Blu-Ray Reader (BD-ROM) ,DVD-RW, CD-RW)
Power: High Capacity 8-cell Lithium Ion \ 240W AC Adapter
Camera: FHD 2.0mp Camera with dual digital microphones
Wireless: Broadcom 4352 WIFI 802.11 n/ac and Bluetooth 4.0
Axis: Windows® 7 Home Premium 64bit
Alienware 18 :
Stone: 4th Generation Intel Core i7-4900MQ processor (8MB Cache, up to 4.0GHz w/ Intel Turbo Boost)
RAM: 16GB Dual Channel DDR3: at 1600MHz
Video Card: Dual NVIDIA GeForce GTX 780M with 4GB GDDR5 – NVIDIA SLI Enabled
Display: 18.4 inch WLED FHD (1920 X1080) TrueLife Display (not 3D)
HDD: 1.5TB RAID 0 (2x750GB 7200RPM) + 80GB mSATA SSD Caching
Drive: Slot-Loading Dual Layer Blu-Ray Reader (BD-ROM,DVD-RW, CD-RW)
Power: 8-cell Lithium Ion (86 wHr)Battery \ 240W AC Adapter
Camera: FHD 2.0mp Camera with dual digital microphones
Wireless: 5G WiFi Broadcom 4352 802.11n/ac and Bluetooth 4.0
Axis: Windows® 7 Home Premium 64bit
The price difference between the laptops will be about 30 kilorubles. Alienware 17 already has cash. does it make sense to scrape together the remaining amount and buy 18? Help with the choice please. Thank you in advance!

Answer 1

Here the main criterion is the diagonal of the screen. And since you take a gaming laptop, then most likely for games. Take more!
Take a tablet to the presentation. Much more convenient)

Answer 2

A 17" + monitor, not an option at all?